If they have let you out of contract then I would look at the leaving process. Ordinarily if you were going to another provider with Superfast package a WLTO would suffice. As you are moving to FTTP with another provider I'd be quizzing whether that will raise a cease on your existing copper connection (with VF).

You don't want to still get billed for services you are not using.

Already to spoke to them. A guy will be monitoring my account and I plan on cancelling it the day before switch over (once BT confirm the date). He has sent me an email detailing once they see I've switched or cancelled they'll remove any charges.