I have a digital subscription to Gramophone, which includes access to their digital archive going back to 1923; the vast majority of 1920s and 1930s issues are presented without the adverts, and indeed without extras included in some issues like the Wilson Protractor, and a stroboscopic speed disc.
I never bothered renewing my subscription as the archive has never been improved to include the ads.
When it was first launched it was also downloadable and I managed to run a decent OCR over it. It took about 10 days to do it's work but now the files are easily searchable.
Alastair, here is a list of search results for Bratley from the 1940's. There was one result from Sept 1952.
" RECORDS.—3,000 all kinds, including dance, 1900-1945, reasonable prices. Instruments: Bratley-Overstall-E.M.G. super outsize acoustic, only one made; H.M.V. 202 outsize oak re-entrant, suitable television conversion; Edison Phonograph two and four minute, with recorder. Best offers.—Appointment; write Bratley, Weyview, London Road, Liphook, Hampshire. Telephone (daytime) Victoria 2323, extension 606 (evening) Liphook 3210. Sept 1952".
A few of the ones from 1940's.
"HAND-MADE Soundboxes, latest pattern, per- feet, few at £3 each.—J. Bratley, 12a, Hill- field Park, Muswell Hill, London, N.10. June 1945"
"A SOUNDBOX for the Connoisseur—The Bratley- Overstall. Individually built and tuned, £4 each. Records bought, sold and exchanged. Soundboxes of all makes repaired. Write or telephone after 6 p.m., Kensington 7995.—John K. Bratley, 341, Chelsea.Cloisters, Sloane Avenue, London, S.W.3. March 1948"
"BRATLEY/OVERSTALL " individual soundboxes for the Connoisseur, £4; all makes repaired.—John K. Bratley. 341 Chelsea Cloisters, London, S.W.3. Kensington 7995 after 6. Dec 1948"