Well, they came today and removed it. Looks a lot neater as the cable went from one side of the house to the other. There's no longer a thick stack of cables running around the house. Let's just say he was not very pleased to be out removing the cable, but the fact of the matter is if it had been removed during installation of my fibre he wouldn't have had to. Still, I'm very happy with how openreach themselves handled it.

In reply to a post by Xuse:

Let's just say he was not very pleased to be out removing the cable

Glad you got it sorted, if he has a problem doing that sort of work he should be telling his line manager rather than the customer.