Hi Jim
Thank you for your welcome and I must say I am excited to receive a reply!
Of the two Mercy Marks I found, the barmaid at the Coventry Cross Hotel does seem a likely suspect. I did waste a lot of time on the coincidence of there being an Edith L Marks, neice to Joseph Lee,the Head, staying there in 1901. This tracked back to a wealthy family of bankers (living in Hove in 1891). Joseph's wife was the link, being a sister to the banker's wife. I believe the 'Muree' you found in 1881 is the same person as the Mercy at the Coventry Cross and she pops up in 1891 with her family but under 'Markes'. Again I have tracked this family back but no clues as to her connection with Arthur Lawrence. One strange coincidence, again, is that there are a family of Lawrence's live just streets away from the Coventry Cross Hotel, including an Arthur George Lawrence, and the mother's maiden name was Lee. Have tried to connect her with Joseph Lee but with no success.
The other Mercy Marks I found was from Whilton Locks, Whilton. I think she was Mercy Beatrice Marks who married in 1909 in Daventry (but no real proof).
The adoption of my grandfather has alway seemed odd in that when he discover he was adopted at 14 he ran away and joined the army (lying about his age) using his real name. The mystery of my grandfather was the driving force behind me entering into the family history world and, although I have only been doing this intensively for a few months I have made great progress on all other areas of the family tree, but this mystery is still the thing that I cannot make any progress on at all. My grandfather died aged 49, before I was born, and no-one in the family had any additional information at all.
Apologies for the long and rambling reply, but I have tried everything I can think of to unravel this with no success at all. I had really hoped to understand who these people were and what happened.
Thank you for your help.
Kind regards
Tracy