Thank-you for the review, Tony. It is very informative and helpful.
I have ordered Otherworld because of the way it goes back to early 1980s D&D which I enjoyed as a student. It sounds to be spot on for what I want.
It should arrive in a day or two so I can see for myself.
Frostgrave has not tempted me yet but, next time I am in England, I will look for a copy in a bookshop.
Regards
Mick