Lynne's got the "Estate" bodywork. What's she's asking for is the rear deck and boot lid, which will originally have been present, before a previous owner cut it out to make an estate. As she says, that's not likely to be an easy find - but certainly worth looking for!
Lynne: if it helps, you can have a good look at my G Tourer at a rally, and you should have a chat to Stan Cornock, who successfully converted his Mk F van to a tourer.