Thanks to Julie Clark for photo.
again many thanks to Selwyn Surgenor for another identification.
This is 15-17 Market Street in Holyhead (Anglesey), currently Burnells Estate Agents (LL65 1UL on google maps - opp Clinton Cards)
You can see RN & AV Thomas Pharmacy is reflected in the front window, (well known to have been at no No 18)
but the key to ID of this one is the unusually shaped hole left by an old alarm box on the edge of the shop next door - its still like that (August 2013)!