Hi, thanks for information on Edward Dagan. However, in spite of police connection (Deggan was superintendent of police in Axbridge District in the fifties) this has to be the wrong man. Edward Deggan lived in Frome, Somerset, where he died in 1899. He was also, I believe, educated at Oxford, in those days a privilege for the comfortably off, so not likely to have been a servant at the time of the '51 census.
I must keep looking!
Paul