In reply to DaveHK:
> Whilst £1000 FS bikes are better than they were that kind of money is still better spent on a HT. It is also more versatile.
5 years ago I would have agreed with you, but I'm not sure that's the case anymore - just look at the specs on the two bikes in question. The full-sus is by far the more versatile bike.
Braking and shifting technology has advanced so much that even lower end stuff performs excellently now. The only potential issue is that you may get a cheaper fork on the full-sus, but the 130mm Sektor on the Boardman full-sus in question is not a bad fork at all - in fact I would argue that it is more capable than the 100mm Recon on the Boardman 29er.
So the question is not "which is the better bike", but "which is the more suitable bike for the OP". The hardtail is lightweight, has the lower rolling resistance of the 29" wheels, and will be whippet fast and great fun on fireroads and smooth trails, but it will start struggling when the going gets rockier. The full-sus will climb steadily, but really come into its own on rougher descents and technical singletrack. ANd not forgetting that it feature the new 27.5" wheel size (which seems to be the future for "all-mountain" bikes).
Personally, I would go for the full-sus. But that does not mean that it is "the better bike", by any means.