@ Rhaseltine- Thankyou . Having looked at so many webpages explaining it I was now starting to think my reading-comprehension abilities were being lost along with my youth and beauty ; ) Phew

" Try and be nice to people, avoid eating fat, read a good book every now and then, get some walking in, and try and live together in peace and harmony with people of all creeds and nations."
-Monty Python