Hello Rootschatters,
This request is no longer needed. Many thanks to anyone who tried to help.
We are now in receipt of a copy of the parish entry from the North Yorkshire Record Office and according to that William Clark was from the parish of East Cowton in North Yorkshire. Unfortunatley we can not find any record of his birth (circa 1780) in that parish !
Ah well, as one question is answered another one opens up.
Cheers,
Kabeja.