Have crack at this one, Beachbum. I`m hoping that you have sorted posting your photos - it`s taken me an hour to post this one as I couldn`t remove the caption.
I`ve reason to believe that you may know where this was taken.
My Granddad is on it at the bottom, dead centre playing the bass trombone.
I estimate the photo was taken just before or, most likely, just after WW1.
The extreme top left and right corners should give it away.