feat: accept ArcGIS ONSPD column aliases (PCD7/PCD8/PCDS) in postcodes:import

tests/Feature/Console/ImportPostcodesTest.php

@@ -63,6 +63,22 @@ CSV;
         ->and(Postcode::find('BT11AA'))->toBeNull();
 });
 
+it('accepts ArcGIS ONSPD exports that use PCD7 instead of PCD', function (): void {
+    $csv = <<<'CSV'
+OBJECTID,PCD7,PCD8,PCDS,DOTERM,LAT,LONG,x,y
+1,"SW1A 1AA","SW1A 1AA","SW1A 1AA","",51.501009,-0.141588,529090,179645
+2,"M1   1AD","M1   1AD","M1 1AD","",53.480957,-2.237428,384730,398295
+CSV;
+
+    $path = writeOnspdFixture($csv);
+
+    $this->artisan('postcodes:import', ['--file' => $path])->assertSuccessful();
+
+    expect(Postcode::count())->toBe(2)
+        ->and(Postcode::find('SW1A1AA')->outcode)->toBe('SW1A')
+        ->and(Postcode::find('M11AD')->outcode)->toBe('M1');
+});
+
 it('derives outcode centroids as the average of member postcodes', function (): void {
     $csv = <<<'CSV'
 pcd,pcds,doterm,lat,long