Are you sure it's Moby and not Mundy ( if it's in a script type might be easy to mistake) as in 1911 the person responsible for the census being filled in there was a Richard Mundy- and everyone living there were Book dealers listed as working at home, so perhaps it was a book shop? The Costa shop I assume you mean being at 143 High St, Marlborough?
If so it might tie in as still listed is Stephen Mundy at 143 High St, which is a Dept store according to this:-
COMPANY NAME:
Mundy,Stephen,
142 High St
Marlborough
SN8 1HN
Swindon
Wiltshire
Marlborough
Wiltshire
South West England
England
The people on the 1911 census were, Richard Mundy -book dealer, Isabella his wife- assistant, his brother William book shop assistant, son William book hop assistant and son Thomas scholar and a servant called Florence Lucas.
If it is in fact Moby then I'm still out of ideas :)