Depending on the games you use you can use around 20-40 Mbytes per hour
Some games with VOIP (Voice) switched on can use up 50-80Mb per hour or more
If you want to monitor your usage then a useful piece of software can be downloaded by clicking here
REQUIRES A BT LINE
Zen offer Broadband Packages ranging from 10GB to Unlimited downloads (£18.00 to £38.00)
Sky detail unlimited packages £15.00 (discount if you take Sky Talk or TV)
BT packages range from 5GB to Unlimited (£16.00 to £25.00)
REQUIRES CABLE TV otherwise there is a Connection fee
VirginMedia provide unlimited but a fair usage policy applies (£15.00 to £50.00)