GlossySpongy
Having walked past earlier, I can only see two doors on the left and right of the front of the building, labelled 58 and 62. I can't see any reasonable access around the sides or back of the property for a hidden 60.

The Royal Mail postcode finder (https://www.royalmail.com/find-a-postcode) only shows a result for 58-62 as a single address.