Hi Andy
Will try to answer on the thread tomorrow, with limitations of course.
But if you email me at
ingot54@gmail.com I am happy to give you the link to the forum where this is set out fairly fully. I notice you do not receive private emails, so this is a good solution.
Meanwhile check back in about 16 hours ... I will have had my snooze by then, and posted a response!
With best wishes
Ingot