Is the direct debit variable each month?
You can log into your account and set the DD to whatever you want, subject to certain conditions such as always ensuring you have at least one months worth of credit.
Your Direct Debit is the same each month. We’ll let you know if you need to increase it.
@Hooloovoo is right, you can change your Direct Debit on your bulb account if you want to change your monthly payments.