They seem to have only been around for a couple of years.
Ace Motors of Oldbury Place first appears in the phone book in August 1938 with that phone number, WELbeck 5166. By the next issue, in February 1939, the address is the same, but the phone number is now WELbeck 5446. Same in August 1939. By the February 1940 issue, they had moved to 49 Praed St W2, but still with the same phone number - WELbeck 5446. Not listed in the November 1940 book.
On the 1939 Register, there are two occupants at 23 Oldbury Place. The handwriting on the form is rather hard to read, but has been rather dubiously transcribed as a Mrs Alice C Reffet, born 1900, and (presumably) her son, Peter Arthur Reffet, born 1923. Her occupation is 'unpaid household duties'. His is 'motor mechanic'. Her wartime occupation is noted as ambulance driver for the LCC.
The alteration to Pullan(?) indicates a subsequent remarriage.