MP -I have a feeling you might break it! A fair few have cracked.
Just searched and plenty of brands come up:
This is a great bike:
http://www.halfords.com/webapp/wcs/s...egoryId_165499
Burly frame build, decent travel fork and good spec.
This Kona is also a good un but you might need a bigger frame:
http://www.halfords.com/webapp/wcs/s...egoryId_165499
The Boardman is currently on offer but as mentioned, I'm not sure it would take much stick. If your riding is smooth with few jumps and bumps, it would be fine. If not, beware. Currently £850 - that is an INSANE bargain!!
http://www.halfords.com/webapp/wcs/s...egoryId_165499