Jim Carroll, please do respond to my last posting.
A few of you have been monopolising this thread,it is true, BUT whilst I found it initially irksome I now believe the opposite.
The contributions from 'the few' have been extremely well informed and of real value to this thread and to myself and many others.
Without you this thread would have died long ago and would never have attracted such quality and diversity of debate.
It is what I hoped for when I opened this discussion,but frankly did not expect to get.
I have been delighted with the response.
This thread may have run its course or it may roll on, either way I am very content.
Thank you to everyone who has contributed.