Thanks both, i use the search engine all the time Paul, a great source of information, guess i did not put a capital W on the Woodchester bit when i typed it in the search bar.
I have the book (page 113) but the pattern looks different and there is no lead crystal clear version which i thought would have been in the line up somewhere.
The description in the boards search facility has to be word perfect or nothing comes up, it's not like Google allowing idiots like myself the odd typing mistake, regards Chris.