A single student coming to Britain in 2009/2010 from overseas should estimate spending £8,000–£10,000 on living costs to cover accommodation, heating, food, travel costs and other daily expenses for a 12-month period (excluding tuition fees) and it will depend on your personal life style.
If accompanied by a spouse or older child you should allow at least an extra £4,000 per year and a minimum of £1,500 for each accompanying young child.