I have found lots more info about Ralph Walker since I made this post & his published Biography. I have details of his parents in the UK & distant family in Jamaica.There is also a connection to the May family in England, Scotland & Jamaica. Please contact me directly. I have alot of info to share. I suspect my walker family was descended from either the 1749-1824 Ralph Walker or one of his sons, who was also called Ralph Walker.
I also managed to find some UK Local libray info about his life & work in England.