Rosie - I found his marriage in London (1918) to Florence Edith Govus. Florence re married in 1929 - and was widowed at the time - I'm assuming Robert passed sometime prior to 1929. He may have changed his name at some time too.....this is what Nat gave me....
Though confusing as on Robert and Florence's marriage cert, his name is Robert Daniel Thompson, on daughter's Florence's birth cert, he is named as Edward Robert Thompson and Robert and Florence have separate different living addresses! Then, on my grandfathers birth cert, Robert is listed as Edward Arthur.
Kay - I don't have full membership to Ancestry.com so haven't checked the census as yet.
Dbreez - Natalie has a copy of the attestation papers, but it is interesting
thank you.
I'll keep hunting - thanks everyone
Donna