EDF/British Gas blue fixed price

Have a look at your bills or on line account and check your T&C's. If you just let it run on without doing anything then you'll probably be put onto the suppliers Standard Variable Tariff which is likely to be significantly more expensive.

Most fixes have a finite limit and require you to take out a new contract when it terminates. If it was a variable tariff then it probably just continues.

You should get a notification between 49 and 42 days before the end of your contract - again check your bills or on line statement to see if the notification is there.