Hi Graham
Just started to research my fathers service history after receiving a copy of his records in the post and came across your photo. The guy seated with glasses (2nd from left) could be my father or either of my uncles.
my father, LAC Ronald Welch, had a twin brother and i beleive they were both in the RAF. as was, i beleive, their older brother. Certainly my father was based in Blackpool for a while, but i am unsure of my uncles service history. I've found an old photo of my father taken in 1946 and he is the spitting image of the person in your photo. However, as far i can tell he was in Blackpool earlier 1940-41 - i will try and get information from the family on his brothers
Regards
Pat