G'Day Again Bruce,
I've basically been focusing on my direct line through my da, his dad, etc via marriage and Birth certs that I've accessed on the site you mentioned which has got me to James and Janet mcEwan.
Interestingly the other site you advised me of has a bit more info and I can find a Tainshe who bore a son James back in 1614 which might lead on a bit back to my James - frustrating but worth perservering with.
I know that the james who married Janet McEwan had a father called James and I understand that records may have been destroyed and that Muthill was subjected to some burning etc so i'll just keep plodding.
Thanks for all your advice it's been very helpful and I'll try your suggestion.
Cheers
JT