Carol, Yes that could easily be him on the electoral roll at number 16 Acfold Road. I know that they lived at number 19 Acfold Road before moving c.1930 to number 11.
Dawn, I have his birth certificate which says he was born on 27th April 1896 at 36 Woodville Road, St John Cardiff son of William George Thomas and Elizabeth Thomas (Christmas)
He is in the 1901 census at 14 Bovingdon Road in Fulham and the 1911 census at 9A Wandsworth Bridge Road, Fulham.
He is the informant on his father's death certificate in 1936 and his mother's in 1947 aswell as the executor of her will. I have looked but not seen a will for him.
The 1948 Electoral roll pushes my knowledge of his whereabouts one year on!!

Thank you all for your help