An amateur opinion
Hi,
I’ll have a guess at the following:-
Newell Orton standing in the middle.
George Brotchie in the bath.
The chap on the left is also a 73 Squadron pilot that I recognise but can’t recall the name. (there is a good pic of him in a group pic of 73 in Peter Cornwalls book on the Battle of France, which I don’t have to hand).
Don’t recognise the gent on the right.
So 73 squadron in the UK possibly just prior to the Battle of France?
Gerry