Could tourers post up any obscure sites (not shown on OS maps) that they've found in areas that are otherwise not well catered for, near cities for example? There must be a few of those.
Just keep it simple, clear and factual - i.e. don't libel anyone!
So I'll start with these
*Good:Elm Farm campsite, on the B3300 near Portreath - http://www.elmfarm.biz. An organic farm site run by a young enthusiastic couple in the mold of Jimmy Doherty (of T.V.s Jimmy's Farm), it's facilities are minimal, but in it's favour, it does have a good well stocked farm shop AND a well run cycle hire/workshop there. It's ideal if your End to End is starting late in the day, as mine did. After the glorious rolling hills of the north Cornish coast road from Land's End (B3306 then B3301), it rounds off a modest start to the big ride. I was able to get some advice and borrow tools from the workshop to fix a niggle on my bike.
*Bad: The council run site at Nairn. £21 for a pitch
*Bizarre: I'm sure there are more bizarre than this out there: The campsite just west of Llandysul (A486), S Wales. It's a descent site largely used by gypsy travellers, with a large flat green and functional facilities. The many kids there were inquisitive, but perfectly friendly. The old boy farmer running it seemed to have his mind on other things and his house is now the pig sty whilst he lives in a big static caravan like everyone else there. "Pay me in the morning" he said cheerily.
So there you go. Place your Good, bad and the bizarre of camp sites here and let everyone else know.