diff --git a/cmd/extract_data.go b/cmd/extract_data.go
index ac5e01db..a6723328 100644
--- a/cmd/extract_data.go
+++ b/cmd/extract_data.go
@@ -38,6 +38,15 @@ func ExtractData(tarBz2File string) {
 	skipped := color.New(color.FgBlue).SprintFunc()
 	successful := color.New(color.FgGreen).SprintFunc()
 
+	err = os.MkdirAll("./data/postcodes/units", os.ModePerm)
+	if err != nil {
+		log.Fatalf("Error creating directory for units: %v", err)
+	}
+	err = os.MkdirAll("./data/postcodes/districts", os.ModePerm)
+	if err != nil {
+		log.Fatalf("Error creating directory for districts: %v", err)
+	}
+
 	for {
 		header, err := tarReader.Next()
 		if err != nil {
@@ -47,11 +56,12 @@ func ExtractData(tarBz2File string) {
 			break
 		}
 
-		if header.Typeflag == tar.TypeReg && strings.HasPrefix(header.Name, "gb-postcodes-v5/units/") {
+		fileType, propName := extractFileType(header)
+		if fileType != "" {
 
-			filename := filepath.Base(header.Name)
-			if exists, err := os.Stat("./data/postcodes/" + filename + ".bz2"); err == nil && !exists.IsDir() {
-				log.Printf("Skipping file %s (already exists)", skipped(filename))
+			outputFile := fmt.Sprintf("./data/postcodes/%ss/%s.bz2", fileType, filepath.Base(header.Name))
+			if exists, err := os.Stat(outputFile); err == nil && !exists.IsDir() {
+				log.Printf("Skipping file %s (already exists)", skipped(outputFile))
 				continue
 			}
 
@@ -66,19 +76,18 @@ func ExtractData(tarBz2File string) {
 				log.Fatalf("Error unmarshalling GeoJSON: %v", err)
 			}
 
-			err = reprocessFeatureCollection(fc)
+			err = reprocessFeatureCollection(fileType, propName, fc)
 			if err != nil {
 				log.Fatalf("Error reprocessing feature collection for file %s: %v", header.Name, err)
 			}
 
-			outputFile := fmt.Sprintf("./data/postcodes/units/%s.bz2", filename)
 			newSize, err := internal.CompressFeatureCollection(outputFile, fc)
 			if err != nil {
 				log.Fatalf("Error compressing file %s: %v", outputFile, err)
 			}
 
 			log.Printf("Processed file %s: original size %s -> %s (%0.2f%% reduction)\n",
-				successful(filename),
+				successful(outputFile),
 				humanize.Bytes(uint64(header.Size)),
 				humanize.Bytes(uint64(newSize)),
 				100-float64(newSize)/float64(header.Size)*100)
@@ -89,18 +98,31 @@ func ExtractData(tarBz2File string) {
 	}
 }
 
-func reprocessFeatureCollection(fc *geojson.FeatureCollection) error {
+func extractFileType(header *tar.Header) (string, string) {
+	if header.Typeflag != tar.TypeReg {
+		return "", ""
+	} else if strings.HasPrefix(header.Name, "gb-postcodes-v5/units/") {
+		return "unit", "postcodes"
+	} else if strings.HasPrefix(header.Name, "gb-postcodes-v5/districts/") {
+		return "district", "district"
+	} else {
+		return "", ""
+	}
+}
+
+func reprocessFeatureCollection(fileType string, propName string, fc *geojson.FeatureCollection) error {
 
 	for _, feature := range fc.Features {
-		postcode, ok := feature.Properties["postcodes"].(string)
+		id, ok := feature.Properties[propName].(string)
 		if !ok {
-			return fmt.Errorf("missing or invalid 'postcodes' property in feature %s", feature.ID)
+			return fmt.Errorf("missing or invalid '%s' property for postcode %s: %s", propName, fileType, id)
 		}
 
+		feature.ID = id
+		feature.Properties["type"] = fileType
 		truncateCoordinates(feature)
 		delete(feature.Properties, "mapit_code")
-		delete(feature.Properties, "postcodes")
-		feature.Properties["postcode"] = postcode
+		delete(feature.Properties, propName)
 	}
 
 	return nil
diff --git a/data/postcodes/districts/AB10.geojson.bz2 b/data/postcodes/districts/AB10.geojson.bz2
new file mode 100644
index 00000000..c1e17e5d
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diff --git a/data/postcodes/districts/AB11.geojson.bz2 b/data/postcodes/districts/AB11.geojson.bz2
new file mode 100644
index 00000000..3dc7a526
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diff --git a/data/postcodes/districts/AB12.geojson.bz2 b/data/postcodes/districts/AB12.geojson.bz2
new file mode 100644
index 00000000..26eb8dbf
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diff --git a/data/postcodes/districts/AB13.geojson.bz2 b/data/postcodes/districts/AB13.geojson.bz2
new file mode 100644
index 00000000..9c5e027c
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new file mode 100644
index 00000000..4b4adcde
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new file mode 100644
index 00000000..9e296ed1
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index 00000000..406a7cde
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index 00000000..8dca0aa5
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index 00000000..f540148c
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index 00000000..c7906efb
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index 00000000..0b849fd0
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index 00000000..aca0475d
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index 00000000..b0ed0959
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index 00000000..933698ca
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index 00000000..fc177ec8
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index 00000000..1a903a2c
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index 00000000..715e5a2b
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index 00000000..9fdbc374
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index 00000000..c5509b7f
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index 00000000..3186f3d7
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new file mode 100644
index 00000000..d7473515
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new file mode 100644
index 00000000..ec189d47
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index 00000000..9068e848
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index 00000000..2a16650a
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index 00000000..5c963bcc
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index 00000000..1e11fb5f
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index 00000000..452dda14
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index 00000000..09bb351e
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index 00000000..ccf6c6b0
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index 00000000..7b556957
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new file mode 100644
index 00000000..ebb33cc6
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diff --git a/data/postcodes/districts/AL1.geojson.bz2 b/data/postcodes/districts/AL1.geojson.bz2
new file mode 100644
index 00000000..8a5c555e
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new file mode 100644
index 00000000..94c4ac28
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index 00000000..f0fe0a5d
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index 00000000..13b23bb8
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index 00000000..43a6f7c3
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index 00000000..0adea99e
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index 00000000..59add4c8
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index 00000000..cade852a
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index 00000000..259361c0
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index 00000000..ee2ad648
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index 00000000..cea16dcd
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diff --git a/data/postcodes/units/WV12.geojson.bz2 b/data/postcodes/units/WV12.geojson.bz2
index c781ee58..3cb7676c 100644
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diff --git a/data/postcodes/units/WV13.geojson.bz2 b/data/postcodes/units/WV13.geojson.bz2
index a06c66a5..bfa67f35 100644
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diff --git a/data/postcodes/units/WV14.geojson.bz2 b/data/postcodes/units/WV14.geojson.bz2
index b8379fab..ed73d394 100644
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diff --git a/data/postcodes/units/WV15.geojson.bz2 b/data/postcodes/units/WV15.geojson.bz2
index 4736e07a..c96b234f 100644
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diff --git a/data/postcodes/units/WV16.geojson.bz2 b/data/postcodes/units/WV16.geojson.bz2
index 074dad39..57e77e6b 100644
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diff --git a/data/postcodes/units/WV2.geojson.bz2 b/data/postcodes/units/WV2.geojson.bz2
index d64d1035..e722c958 100644
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diff --git a/data/postcodes/units/WV3.geojson.bz2 b/data/postcodes/units/WV3.geojson.bz2
index 8a8a52c2..927f76d7 100644
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diff --git a/data/postcodes/units/WV4.geojson.bz2 b/data/postcodes/units/WV4.geojson.bz2
index 0dd75966..7e9808a4 100644
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diff --git a/data/postcodes/units/WV5.geojson.bz2 b/data/postcodes/units/WV5.geojson.bz2
index 6324c75a..cbce8f59 100644
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diff --git a/data/postcodes/units/WV6.geojson.bz2 b/data/postcodes/units/WV6.geojson.bz2
index 9c713946..1de65663 100644
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diff --git a/data/postcodes/units/WV7.geojson.bz2 b/data/postcodes/units/WV7.geojson.bz2
index d0dabc6f..69e0865d 100644
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diff --git a/data/postcodes/units/WV8.geojson.bz2 b/data/postcodes/units/WV8.geojson.bz2
index bb4aa1cd..4858a4cf 100644
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diff --git a/data/postcodes/units/WV9.geojson.bz2 b/data/postcodes/units/WV9.geojson.bz2
index 66a472f5..ce052214 100644
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diff --git a/data/postcodes/units/WV98.geojson.bz2 b/data/postcodes/units/WV98.geojson.bz2
index e3e56e45..a3fb3cf2 100644
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diff --git a/data/postcodes/units/WV99.geojson.bz2 b/data/postcodes/units/WV99.geojson.bz2
index ab1fb2ec..c5d6372e 100644
Binary files a/data/postcodes/units/WV99.geojson.bz2 and b/data/postcodes/units/WV99.geojson.bz2 differ
diff --git a/data/postcodes/units/YO1.geojson.bz2 b/data/postcodes/units/YO1.geojson.bz2
index 8375563c..3edb617b 100644
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diff --git a/data/postcodes/units/YO10.geojson.bz2 b/data/postcodes/units/YO10.geojson.bz2
index aa3d8b0b..662c4ab9 100644
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diff --git a/data/postcodes/units/YO11.geojson.bz2 b/data/postcodes/units/YO11.geojson.bz2
index d446615a..0f576bd8 100644
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diff --git a/data/postcodes/units/YO12.geojson.bz2 b/data/postcodes/units/YO12.geojson.bz2
index e9c83ce5..46df9d58 100644
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diff --git a/data/postcodes/units/YO13.geojson.bz2 b/data/postcodes/units/YO13.geojson.bz2
index f72ae86f..2b8517b4 100644
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diff --git a/data/postcodes/units/YO14.geojson.bz2 b/data/postcodes/units/YO14.geojson.bz2
index efbe3196..6b275ab4 100644
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diff --git a/data/postcodes/units/YO15.geojson.bz2 b/data/postcodes/units/YO15.geojson.bz2
index ada0f780..e68a40bb 100644
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diff --git a/data/postcodes/units/YO16.geojson.bz2 b/data/postcodes/units/YO16.geojson.bz2
index e4bc7669..722cdce8 100644
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diff --git a/data/postcodes/units/YO17.geojson.bz2 b/data/postcodes/units/YO17.geojson.bz2
index 82a438e1..d47e7121 100644
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diff --git a/data/postcodes/units/YO18.geojson.bz2 b/data/postcodes/units/YO18.geojson.bz2
index 829e4128..f0d0e6de 100644
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diff --git a/data/postcodes/units/YO19.geojson.bz2 b/data/postcodes/units/YO19.geojson.bz2
index 6ea0bd9e..6c976101 100644
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diff --git a/data/postcodes/units/YO21.geojson.bz2 b/data/postcodes/units/YO21.geojson.bz2
index 4d3f976c..a423e497 100644
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diff --git a/data/postcodes/units/YO22.geojson.bz2 b/data/postcodes/units/YO22.geojson.bz2
index 0d1863df..65f4dbb2 100644
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diff --git a/data/postcodes/units/YO23.geojson.bz2 b/data/postcodes/units/YO23.geojson.bz2
index c16dd33c..72336a57 100644
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diff --git a/data/postcodes/units/YO24.geojson.bz2 b/data/postcodes/units/YO24.geojson.bz2
index 84148561..972f2fe7 100644
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diff --git a/data/postcodes/units/YO25.geojson.bz2 b/data/postcodes/units/YO25.geojson.bz2
index 31d40e66..6cb1b1fe 100644
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diff --git a/data/postcodes/units/YO26.geojson.bz2 b/data/postcodes/units/YO26.geojson.bz2
index 59da6b45..8c3595da 100644
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diff --git a/data/postcodes/units/YO30.geojson.bz2 b/data/postcodes/units/YO30.geojson.bz2
index 8625a8f9..38235406 100644
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diff --git a/data/postcodes/units/YO31.geojson.bz2 b/data/postcodes/units/YO31.geojson.bz2
index dba6ed67..bbd99c1f 100644
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diff --git a/data/postcodes/units/YO32.geojson.bz2 b/data/postcodes/units/YO32.geojson.bz2
index afe95bde..47ea1ac1 100644
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diff --git a/data/postcodes/units/YO41.geojson.bz2 b/data/postcodes/units/YO41.geojson.bz2
index f6bb7d29..bb08190b 100644
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diff --git a/data/postcodes/units/YO42.geojson.bz2 b/data/postcodes/units/YO42.geojson.bz2
index 6931c454..5773f8df 100644
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diff --git a/data/postcodes/units/YO43.geojson.bz2 b/data/postcodes/units/YO43.geojson.bz2
index 7739bd95..415f7d00 100644
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diff --git a/data/postcodes/units/YO51.geojson.bz2 b/data/postcodes/units/YO51.geojson.bz2
index 4d543ad7..0dee5e4e 100644
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diff --git a/data/postcodes/units/YO60.geojson.bz2 b/data/postcodes/units/YO60.geojson.bz2
index 203e7093..df29dc42 100644
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diff --git a/data/postcodes/units/YO61.geojson.bz2 b/data/postcodes/units/YO61.geojson.bz2
index 8e028fc1..7d2c8d96 100644
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diff --git a/data/postcodes/units/YO62.geojson.bz2 b/data/postcodes/units/YO62.geojson.bz2
index e67ff445..c9e5dd99 100644
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diff --git a/data/postcodes/units/YO7.geojson.bz2 b/data/postcodes/units/YO7.geojson.bz2
index 0b8a0b3f..ca4157a8 100644
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diff --git a/data/postcodes/units/YO8.geojson.bz2 b/data/postcodes/units/YO8.geojson.bz2
index afd8d1c9..5b458c4b 100644
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diff --git a/data/postcodes/units/YO90.geojson.bz2 b/data/postcodes/units/YO90.geojson.bz2
index dd6f9003..55e8fbcd 100644
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diff --git a/data/postcodes/units/ZE1.geojson.bz2 b/data/postcodes/units/ZE1.geojson.bz2
index 3213f060..072464bc 100644
Binary files a/data/postcodes/units/ZE1.geojson.bz2 and b/data/postcodes/units/ZE1.geojson.bz2 differ
diff --git a/data/postcodes/units/ZE2.geojson.bz2 b/data/postcodes/units/ZE2.geojson.bz2
index 981debe4..8875be24 100644
Binary files a/data/postcodes/units/ZE2.geojson.bz2 and b/data/postcodes/units/ZE2.geojson.bz2 differ
diff --git a/data/postcodes/units/ZE3.geojson.bz2 b/data/postcodes/units/ZE3.geojson.bz2
index 12e0bc0e..d1954857 100644
Binary files a/data/postcodes/units/ZE3.geojson.bz2 and b/data/postcodes/units/ZE3.geojson.bz2 differ
diff --git a/routes/search.go b/routes/search.go
index 11168cce..9c9334fc 100644
--- a/routes/search.go
+++ b/routes/search.go
@@ -31,6 +31,11 @@ func CodePointSearch(spatialIndex *spatialindex.SpatialIndex) func(c *gin.Contex
 			return
 		}
 
+		if isTooBig(bbox) {
+			c.JSON(http.StatusBadRequest, gin.H{"error": "bbox is too large, must be less than 5km in width and height"})
+			return
+		}
+
 		results, err := spatialIndex.Search(bbox)
 		if err != nil {
 			log.Printf("error while fetching postcode data: %v", err)
@@ -53,13 +58,20 @@ func PolygonSearch(spatialIndex *spatialindex.SpatialIndex) func(c *gin.Context)
 			return
 		}
 
-		requestedPostcodes := make(map[string]struct{}, 100)
+		tooBig := isTooBig(bbox)
+		target := map[bool]string{true: "districts", false: "units"}[tooBig]
+
+		requested := make(map[string]struct{}, 100)
 		districts := make(map[string]struct{}, 20)
 
 		err = spatialIndex.SearchIter(bbox, func(min, max [2]uint32, postcode string) bool {
 			district := strings.Split(postcode, " ")[0] // Take the first part of the postcode
 			districts[district] = struct{}{}
-			requestedPostcodes[postcode] = struct{}{}
+			if tooBig {
+				requested[district] = struct{}{}
+			} else {
+				requested[postcode] = struct{}{}
+			}
 			return true
 		})
 		if err != nil {
@@ -68,32 +80,23 @@ func PolygonSearch(spatialIndex *spatialindex.SpatialIndex) func(c *gin.Context)
 			return
 		}
 
-		isRequestedPostcode := func(feature *geojson.Feature) bool {
-			postcode, ok := feature.Properties["postcode"].(string)
-			if !ok {
-				return false
-			}
-			_, exists := requestedPostcodes[postcode]
-			return exists
-		}
-
 		fc := geojson.NewFeatureCollection()
-		fc.Features = make([]*geojson.Feature, 0, len(requestedPostcodes))
+		fc.Features = make([]*geojson.Feature, 0, len(requested))
 
 		for district := range districts {
-			filename := fmt.Sprintf("./data/postcodes/units/%s.geojson.bz2", district)
+			filename := fmt.Sprintf("./data/postcodes/%s/%s.geojson.bz2", target, district)
 			featureCollection, err := internal.DecompressFeatureCollection(filename)
 			if err != nil && os.IsNotExist(err) {
-				log.Printf("polygon file for district %s does not exist, skipping", district)
+				log.Printf("polygon file %s does not exist, skipping", filename)
 				continue
 			}
 			if err != nil {
-				log.Printf("error loading polygon for district %s: %v", district, err)
+				log.Printf("error loading feature collection from file %s: %v", filename, err)
 				c.JSON(http.StatusInternalServerError, gin.H{"error": "An internal server error occurred"})
 				return
 			}
 			for _, feature := range featureCollection.Features {
-				if isRequestedPostcode(feature) {
+				if _, exists := requested[feature.ID.(string)]; exists {
 					fc.Append(feature)
 				}
 			}
@@ -123,9 +126,9 @@ func parseBBox(bboxStr string) ([]uint32, error) {
 		return nil, fmt.Errorf("invalid bbox: min values must be less than or equal to max values")
 	}
 
-	if math.Abs(float64(bbox[2]-bbox[0])) > MAX_BOUNDS || math.Abs(float64(bbox[3]-bbox[1])) > MAX_BOUNDS {
-		return nil, fmt.Errorf("bbox must define a valid area (no more than %d KM in either dimension)", MAX_BOUNDS/1000)
-	}
-
 	return bbox, nil
 }
+
+func isTooBig(bbox []uint32) bool {
+	return math.Abs(float64(bbox[2]-bbox[0])) > MAX_BOUNDS || math.Abs(float64(bbox[3]-bbox[1])) > MAX_BOUNDS
+}