The idea behind pre-pay meters is so low income households or those with a history of poor payments can still get juice but cant get into debt/get disconnected. I'm sure neither of you fine upstanding gentlemen fall into that category. Whilst only paying for what you use? may seem attractive you are paying over the odds, part of each token is paying the equivalent of a standing charge. Monthly direct debit is the cheapest option, and if you can add on gas aswell the price drops again. R#?