Thanks for the comments. Job done, wet the whole area, was able to remove the full sheets without much of a problem. No dust or any debri from removal so all is well. A close look at the stuff shows that it is it appears without fibre of any kind. It breaks up quite easly when wet. It was new in 1992 so should have no asbestos fibre in it but you could not really rely on that information.
I have been carefull in its removal so should not have or create any problems.
Kind Regards and Thanks
Mike.