Like Trailmonkey said, pick the bike that suits the terrain you're riding on.
The Boardman or even a Trance X5 are good exceptions to the sub-£1000 full suss. I bought a £700 Scott G-Zero 9 years ago and never looked back. Both the X5 or the Boardman have decent forks (some hardtails are still coming with low rent RS Tora forks at that kind of price) and reasonable kit. With not too much if any a weight penalty over a hardtail at this price, fitting fast rolling tyres and pumping the suspension up harder will be enough to make it feel fine on easy terrain and will allow you to progress when you get to more tricky trails.
Equally, if you're just starting out and see a hardtail as the way to go, don't get drawn in by over built play bikes or all mountain. They will be way over built for what you need and likely heavier than the full suss options.
Too many people on here seem to see owning a hardtail first as a rite of passage!!?