Welcome to OpenStreetMap and thanks for helping to keep Access Self Storage's branches up to date.

Just a couple of minor points - addr:housename is for a distinct building name rather than a partial duplication of the address, phone numbers should be in international format (+44 20 31312794) and there's a branch tag you can use.

https://wiki.openstreetmap.org/wiki/Addresses_in_the_United_Kingdom
https://wiki.openstreetmap.org/wiki/Key:phone
https://wiki.openstreetmap.org/wiki/Key:branch