Get in touch with Craig Flintham up the road in Lincoln, hes got a few beetles in or may be able to put you onto one
imho pistonheads is where poeple sell their bugs to get the top price (i've known this happn a lot - but, people pay it : ). local ads are good, but as always.. check the bottom six inches, sills, heater channels, under the spare, and floorpan. anything after that is just dressing i'll keep my eyes open for you (for some reason i get offered bugs quite a bit, i only have a bug and a bay, i'm not a collector- these are my 'proper' cars!).
http://www.pistonheads.com/sales/3122366.htm This kind of thing, original condition. Would prefer red and a bit cheaper though.