Organised air pistol shooting was very limited in the U.K. prior to WW2. The only references I have been able to find are a number of 'Have a Go' competitions at Bisley during formal rifle meetings. Webley used to organise them and it was as much a way of marketing their pistols as anything else.
I'd love to learn of more organised prewar pistol comps either here in the U.K. or worldwide as this is a fascinating subject.
John M
Currently looking for Baikal Makarov pistols with the following prefixes to the serial number: 98, T01, T09, T21, T22
Prefer boxed or cased but will consider loose examples too.