Decent hardtail <£500 - suggestions

[pennywise]

So our cycle to work scheme has kicked off again and I'm looking to take advantage by getting a mountain bike both for getting to/from work but also for a bit of trail riding and general off-road stuff. My indecisiveness has got the better of me though and I've looked at so many bikes I've become completely lost. Basically I'm trying to set myself a budget of £500 for the bike itself, and it has to be from Halfords or Tredz (which ruled out my original choice of a Vitus Nucleus 275 VRS ). If anyone can recommend anything with a similar spec/price I'd appreciate it.

 

[pennywise]

Thanks for the input everyone. I think the main thing I'm looking for is a bike with adjustable shocks as I'll be going over a fair mix of ground - rough forest tracks, gravel, normal roads etc. I'd give the Voodoo Bizango serious thought if I knew it was going to be on offer soon but I've arsed about too long so want to get something sorted preferably before the end of the month. Tredz has a far bigger collection than Halfords, so I've been looking at these few this morning:
http://www.tredz.co.uk/.Saracen-TuffTrax-Disc-27-5-Mountain-Bike-2017-Hardtail-MTB_98545.htm
http://www.tredz.co.uk/.Merida-Big-Nine-20D-29er-Mountain-Bike-2017-Hardtail-MTB_95793.htm

Or on the lower end of the scale:
http://www.tredz.co.uk/.Saracen-TuffTrax-Disc-27-5-Mountain-Bike-2017-Hardtail-MTB_98545.htm

Any thoughts or opinions on these compared to those mentioned from Halfords? It also seems that stretching the budget to about 550-600 offers a lot more for your money (eg), is there anything really outstanding for the money (other than the Bizango) at this price?