Hello!
Thanks for all your replies!!
re: the date - I estimated he was in his early 20's but that may be wrong. So if the consensus is that it is post 1914 that would would make him 34+, at which point he was living in Wales (so I currently cant find him on the 1911 census). 1920's would make him in his 40's and back in South Glous, i'm not convinced he's quite that old, the chap on the chair looks to me more like he's in his 40's.
re: his height - I don't have an exact height, but from other later pictures he looks quite tall. His brother was 5' 10 on his WW1 conscription forms and my grandad was 6ft.
re: his neck - I was told that his head was tilted because of a cord in his neck (?) which was trapped at birth, and his mother refused to let him have an operation to correct it, (she died in 1908) but he did so later on. (Although that may not be that accurate)
Looks like the general concensus is that they are probably beaters for a shoot then!
I did find these pictures on the net of a beagle hunt - with a not to dissimilar dress.
http://www.hunting-directory.co.uk/gallery/huntname_caynsham-0.phpDeb - yes I had a look on microsoft maps ariel pictures and the land definitly looks good for hunting, with large grassy fields and hedges, so it may well be a local building.
Thanks,
acceber