Hi,
Prepayment meters are never a good idea as they cost you more, but often if you've got a prepayment meter you don't really have a choice.
Basically prepayment meters work like this:
1. The £1 weekly standing charge will be deducted from the balance on the meter. This could either happen on a certain day, but it's more likely to be taken off daily. I.e. at 14.28p per day.
2. You don't need to go to the bank to put money on a pre-payment card. Plenty of supermarkets, post offices, and corner shops have facilities for this. You'll be given a card by your supplier that is tied to your electricity account. You then insert this into the meter and it will read the balance you have put on it.
3. Never ever ever buy "cheap" prepay cards off someone in the pub. These are not tied to your account, the money won't be registered against your balance, and the energy company will still want the money off you so you'll end up paying for the usage twice.
4. It really doesn't matter if you put loads of money on your pre-pay card all in the one go or if you put a bit on every week. The standing charge will get deducted at the same rate, and you'll only use as much balance related to the electric you're using.