Depends how you want to pay your bills as different companies offer direct debits with 10% knocked off your bill per annum.
I pay, roughly, 25/month for water; electricity/gas 32 month from one company; council tax varies from council to council so check their website unless landlord is including this within the rent; insurance (contents only as the landlord is meant to insure the building) will also vary according to where you are. So if you are paying, we will use a round figure of �750/per month on rent you will need to have at least 200 on top for your bills and then whatever your food is per month. But as I said, these amounts vary from place to place as does rent so you need to make sure that you use the family connection to the best of your ability!