I found this in the 'Hampstead News' dated 19th November 1953: “SPECIAL ANNOUNCEMENT - NELSON'S Theatre and Travel Agency (GRAMOPHONE RECORDS) 12 Frognal Parade, Finchley Road, N.W.3. Tel.: HAM 3655. A FIRST-CLASS TICKET AND TRAVEL AGENCY AND GRAMOPHONE RECORD ESTABLISHMENT HAS NOW OPENED AT THE ABOVE ADDRESS.”
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12 Frognal Parade, Finchley Road NW3 6AHFinchley / London
“SPECIAL ANNOUNCEMENT - NELSON'S Theatre and Travel Agency (GRAMOPHONE RECORDS) 12 Frognal Parade, Finchley Road, N.W.3. Tel.: HAM 3655. A FIRST-CLASS TICKET AND TRAVEL AGENCY AND GRAMOPHONE RECORD ESTABLISHMENT HAS NOW OPENED AT THE ABOVE ADDRESS.”