Add operator 'UK' to supported PIS TOCS - see issue for details.

Closes #37

Signed-off-by: Fred Boniface <fred@fjla.uk>

src/services/pis.services.js

@@ -5,7 +5,8 @@ const log = require('../utils/logs.utils');
 const clean = require('../utils/sanitizer.utils');
 
 const supported = [
-  'GW'
+  'GW',
+  'UK'
 ];
 
 async function findPisByOrigDest(start,end) {