Guys- okay, was definitely worth posting, a few good ideas. I'm going to explore the other bikes mentioned, so it's a few days reading reviews and doing 'builds' on an excel spreadsheet (sad and anal I know, but part of the fun).
Got thrown a curve ball yesterday evening also, was out on my old bike with a pal and on the way past his he suggested I borrow his Speccy Enduro Pro 2006, much upgraded and spangly and rarely used. In essence I can get a practically brand new bike for less than half price, but it's four or five season out of date. Probably not – I'm not that interested in full suspension – but worth a few trial spins. At the very least it's something novel to ride while I sort out a hardtail.
Dickbarton, I think you're right, I don't want to give them the money, so Sannys Ambleside suggestion is going to be the Orange option if it comes to that.
Over and out!