The Direct Debit Scheme allows you to pay regular amounts for your oil over the course of the year so you can spread your cost out and not pay large amounts during the winter months.
Decide on the amount that you think will cover you each month for the year, for example, £50 or £60 and then add this amount in and choose your date each month that it is to be paid. Then send the form to your bank.
Please note that you can cancel or amend your Direct Debit at any time. After the first year you will probably know the amount to pay each month to cover you for the year.