Hi martin, No offence taken, didn't think for a moment that was what you meant. I kindly accept all info given. It all goes to advance a persons knowledge in whatever scope. That's really the only way to learn! That's how I've done it, getting my hands dirty and reading. Our age group (65 yrs) didn't have the advantage of t'internet wish we had, so much easier.
Many many thanks for your replies.
Have a super new year.
Barrie