With sincerest apologies Mark, I have not been on this forum for quite some time.
Your details about Leslie Walker are fascinating. Perhaps you know that according to one source he was born in 1778 and was the natural son of Laughlin Macleane, a shameless adventurer who died in 1778. Walker's mother also appears to have another illegitimate child by a second man, George Musgrave, a lawyer and MP.
I wonder do you know the surname of Leslie Walkers's wife, Harriet and the names of his two children with her.
best regards
Keith