3 ITW was 3 Initial Training Wing (Aircrew Training Scheme) based in Torquay. It would explain the aircrew in the second picture. I have a feeling that "3 Squadron" refers to the class or something because if the photo was taken there then it's too early for them to have been assigned a squadron.
Beaufighter TF Mark Xs (NV427 'EO-L' nearest) of No. 404 Squadron RCAF based at Dallachy, Morayshire, breaking formation during a flight along the Scottish coast. February 1945.