Dear Listers Just to say thank you to everybody who replied to my enquiry re: the above subject. The information you gave will save valuable time on what will be a very brief visit to the library. Having said that I will get to know the routine for when I return (sounds like a Christopher Lee film), in October for a longer spell in front of a reader. Don't you just hate it when people don't wind the film back to the beginning. Regards Gordon Davidson