Thank you again for very clear explanations and suggestions which I will take away and try out. With luck this will not result in another post by way of a cry for help.

I take your and diotalevi's point about the length of the post. As I was typing I kept thinking "this is getting too long." I should have split it in two. But I am also aware of the number of posts where not enough information is given and Monks are left guessing what the problem might be.

Anyway, thanks again,

JohnGG