Philippa, if you read the rest of the messages when you log in to the message board you will get many tips which will help you.
Currently two messages down from your one, under "Re: William Carrin and Jane Callister" I have told Jess how to order LDS films to view parish registers. The same process applies to ordering wills, and Brian has supplied the film numbers on his index.

You could also check Ian Radcliffe's website: lawsonsiom.freevar.com/ for hundreds of more recently transcribed wills.

Sue