Hi Kitz,
a useful site thanks but you have the exchange in Bangor, Gwynedd North wales in the wrong place.
You give the postcode as LL572UR which is about half a mile out.
The exchange is at the corner of Deiniol Rd and Garth Rd just next to the old offices of Bangor Citizens Advive Bureau at no. 60. Their postcode was LL57 2RF. That is a close guess at the postcode but LL57 2RG looks spot on according to Streemap.
Regards
Phil