crocodilian – Stu Mcgroo, probably around £1500.
Those Singulars look lovely but that Diamond Back's surprised me, looks very good too.
several in the fifteen hundred quid bracket, my research so far has found these (in no particular order);
giant xtc2 £1400, gary fisher paragon £1400, kona big kahuna £1280, khs flagstaff £1199 and rocky mountain vertex £1499.
all are complete bikes, off-the-shelf and hardtail except the khs which is full suss, the vertex might be hard to track down and there are cheaper versions of the giant, fisher and kona but the ones i listed are the closest to £1500.
as for frame only, if you've got to source all the bits you can be into stupid money just to get an average build, if you've got bits lying around it might be different but i haven't so i deffed the idea.
and the diamond back surprised me too. wonder how much it weighs? or what happens when you start to hammer it? you can pay over the odds for a name but at the lower of the market you invariably get what you pay for and common sense tells me at £199 you ain't paying for much. :-)