Hello,
I came across your posting and thought I should reply. I am a descendant of Keith Jopp, he was my 4th great grandfather. I descend through his second wife Eleanor Campbell. they were married in Jamaica.. They had several children born in various places including England , Jamaica, and one daughter born in Germany.
Keith's first wife was Isabel Douglas.
Yes, he was very active in the Slave trade, including being part owner of I think it was 3 ships. There is a website that has details of that.
I have his parents as being James Jopp 1720-1794 and Jean Moir 1730-1782.
Jean Moir's parents were George Moir and Jean Forbes.
George's parents were Andrew Moir and Agnes Montgomerie.
I hope this may be of interest to you and if I can help you with anything else I would be delighted.
Look forward to hearing from you.
Elaine