Jack continues to prove elusive, but we've found his death certificate which has given us a few more clues.
We now know that Jack died on 3rd February 1953 aged 54, of acute bronchitis and emphysema. But we know that he was born in October 1896 so he was 56 not 54. And he was still a watch maker, and his address was 27 Park Road Hampton Wick Twickenham.
The death was registered by his mother in law M L Hawkins of 68 Richmond Park Road, Kingston upon Thames.
My mother visited Jack in 1939. She always said he lived in Kingston upon Thames but the 1939 census shows him living at 147 High Street Uxbridge. Also on the census is his wife. Her name has been transcribed as Patricillia, which is absurd. Looking closely at the original it looks like Letitia M.
Her date of birth was given as 26th May 1911. I have not managed to find her birth registration or the registration of their marriage.
The Hawkins family were living at 68 Richmond Park Road in 1939, William Charles Hawkins ( no job, private means) born 1884, Mary L Hawkins born 1885. (this is the woman described as Jack's mother in law in 1953 who is only a year older than him) and three adult children Lettie born 1912, a nurse, Richard born 1916, an aircraft wing assembler, and Constance born 1917, who is at home. But I cannot find the family in Surrey or Middlesex in 1911.
Surely the Letitia described as Jack's wife and the Lettie, described as a single daughter are the same person. Were they actually married. Jack was divorced so there was no reason why they shouldn't be .
So the mystery still isn't solved.