Hi Keith,
Could the man in the middle be H.R.P. 'Dick' Pertwee. The second from the left doesn't really look like 'Tony' Fowler, and he was a New Zealander.
On a related note, later this year or next year we'll be publishing an article about two of the No. 111 Squadron Australian pilots, Barry Gale and Harold D. Christian.
Cheers,
Andrew A.
Air War Publications -
www.airwarpublications.com/earticles