Hi Helen
Paying by quarterly statements is one of the most expensive ways to pay - you are best to pay by direct debit as the unit rates are always lower no matter what company you go with. If you can pay by direct debit, it is best to get your pre payment meter changed to a 'credit meter' and then go for a dual fuel package as this always works out to be the cheapest method - a lot of companies will change the meter for free so just call whoever your electric is with and ask them. if you do decide to go onto direct debit for both, always call the company you are thinking of going to and get their unit rates and compare.