Does anyone know of a decent Freddie Mercury entertainer for a private function?

Try Spot-On Entertainment (Based in Stockport): http://www.spotonentertainment.co.uk/

They have most kinds of tributes, also many other really 'camp' acts (If that's your thing) such as 3 Drag Queens, including me. If you would ever like a Drag Queen, I'll be happy to do a show at a special rate in the Sheffield area as I live in the city centre.

Best of Luck for a Freddy Mercury, though!

try BIGenterntainments http://www.bigentertainments.com/