In reply to Dr.S at work:
The Whytes are good bikes, not ridden one but a lot of people rave about them (though that's possibly the top end of the range - there are carbon hardtails at £3.5K!!)
There's a lot of (marketing) niches in mountain biking but in reality most bikes will do most things though obviously they'll excel at one style of riding and you need to compromise on the rest. If you ride trail centres a lot then a full suspension bike is going to suit you more than a hardtail but last weekend I rode at Ae, Glentress and Innerleithen on a hardtail and didn't feel that the bike was holding me back. (If truth be told, it was the 80Kgs of lard sat on the bike that was the problem
)
There's such a wide range of stuff these days, there's three wheel sizes plus the newer high volume + tyres, then rigid; hardtail or full-suss so just with those two variables there are 18 options! Last weekend among our group there were 26" full suss bikes; a semi-fat bike (rigid frame with 3" tyres on 26" wheels); 650b full-suss bikes and a couple of hardtails. Back in the 1990s a big tyre would be something like a 2" with many people running 1.8", these days 2.3 or 2.4 are fairly standard, the difference in grip is amazing.
If you are mainly in to long days on traditional bridleways then a hardtail with 29" wheels is hard to beat, it's what I have, but as above if you ride trail centres then a full suss would be better in the long term. I'll drop you a PM with something I sent to Escher who posts on here.