My initial thoughts - look elsewhere. That bike has alot of features that attempt to emulate a higher end mountain bike (disc brakes, suspension fork) that ultimately rob possible quality from other components within a tight price bracket.
The result: A bike that won't really perform very well and will be a maintenance nightmare. A marginally better choice in a mountain bike style would be this one: http://www.all-about-the-bike.co.uk/...ery-3654-p.asp or this: http://www.all-about-the-bike.co.uk/...very-498-p.asp

Perhaps some of our UK folks can provide some leads on alternative sources for bikes.

My advice would be to look for a 1990's mountain bike with a rigid fork (no suspension). You'd have a durable bike that would do fine both on and off road.

Some specifcs of your commute may also help. Total distance, how much off/on road, terrain? (hilly, flat, how rugged is the off road portion, etc)

If you do not have to contend with major hills or technical offroad terrain, something like this would be far better suited (IMO) to commuting duty and should be much easier to maintain : http://www.all-about-the-bike.co.uk/...ery-2545-p.asp

Good luck!