The cost of living depends where you live....

argument sake, while in london, you can rent a two bedroom house (fully furnished) ranging from 900 - 1500 pounds.

Gas, electricity is for a small family is 150 - 200 pounds per month /also depends upon usage.

Supplied, cheapest options are TEXCO, ASDA or Lidl.

transportation is expensive by Tube, Buses are cheaper and one can buy daily, weekly or monthly pass.

If one decided to buy car, has to pay a lot in terms of road tax, parking charges, MOT(minimum road worthy condition) for car, seperate driving insurence...if more than one person using same car.
Fuel is pretty expensive.

phone is cheap