diff --git a/lib/tasks/schools.rake b/lib/tasks/schools.rake
index 0b1f2c6c91..f3aea5f82f 100644
--- a/lib/tasks/schools.rake
+++ b/lib/tasks/schools.rake
@@ -79,6 +79,16 @@ namespace :schools do
         )
       # rubocop:enable Rails/SaveBang
 
+      # Some URLs from the GIAS CSV are missing the protocol.
+      process_url = ->(url) do
+        return nil if url.blank?
+        url.start_with?("http://", "https://") ? url : "https://#{url}"
+
+        # Legh Vale school has a URL of http:www.leghvale.st-helens.sch.uk
+        # which is not a valid URL.
+        url.gsub!("http:www", "http://www")
+      end
+
       CSV.parse(
         csv_content,
         headers: true,
@@ -96,15 +106,15 @@ namespace :schools do
           town: row["Town"],
           county: row["County (name)"],
           postcode: row["Postcode"],
-          url: row["SchoolWebsite"]
+          url: process_url.call(row["SchoolWebsite"].presence)
         )
 
         if locations.size >= batch_size
-          Location.import locations,
-                          on_duplicate_key_update: {
-                            conflict_target: [:urn],
-                            columns: %i[name address town county postcode url]
-                          }
+          Location.import! locations,
+                           on_duplicate_key_update: {
+                             conflict_target: [:urn],
+                             columns: %i[name address town county postcode url]
+                           }
           locations.clear
         end
 
@@ -113,11 +123,11 @@ namespace :schools do
 
       # Import remaining locations in the last incomplete batch
       unless locations.empty?
-        Location.import locations,
-                        on_duplicate_key_update: {
-                          conflict_target: [:urn],
-                          columns: %i[name address town county postcode url]
-                        }
+        Location.import! locations,
+                         on_duplicate_key_update: {
+                           conflict_target: [:urn],
+                           columns: %i[name address town county postcode url]
+                         }
       end
     end