Agreed, Bronte; the joys of house sharing! Whenever I house shared, there were different housemates who had to take on the paying of utilities and the rent. Then one of them would leave, sometimes not paying their share. Occassionally, the one meant to be paying the bill just pocketed the money when he left and never paid the bill.
However, even with a pre-pay, I can still see one of the housemates is not gping to pay his share; or is that just the mistrust in me?