I suggest that you search '48 Sqn RAF' on line as there is quite a lot about the squadron. I'd not bother with Wikipedia but try some other sites -
48 Squadron is quite a good start but there are others with a lot of information. There's quite possibly a squadron association which might be able to help. You could also have a look on FaceBook to see if the squadron has a presence there. Whatever you do, persevere as you may need to go down several routes to find out all there is available.
Good hunting!