Further to what Bucksgirl said:
The only certificates that can be purchased are for civil registration records, which began in 1837. For church records, you can look at microfilms of the registers (the original books are looked away) in the county archives.
You may be able to get a photocopy of the entry from Bucks Archives. Web page as given by bucksboy. Telephone 01296 382587 (+44 1296 382587 from abroad) or email
archives@buckscc.gov.ukMudgeemaind? From Mudgee? I once visited it, when I was working in Australia in 1999. Some nice local wine, I remember, & a restaurant with excellent food, mostly from local ingredients, which we washed down with several bottles we'd bought while touring vineyards.
