Thanks Colin for the information. I think there could be a connection, as you say it is a very unusual name.His father was Henry Capper, Grandfather Samuel Capperand thats about as far as I have got. I did find a Cawthorne Jasper Capper in Nottingham in 1860's but I haven't been able to connect the two yet.
My Cawthorne was known as Dick he served in the Canadian Army during WW1 and was injured. He never married, and is buried in Canada.
Any info would be gratefully received