Don't be fooled by "high speed fibre broadband" that actually is just slow ADSL. The trick is that the fibre goes to the green box at the end of your street, so that makes it "fibre".
Are you certain that Virgin actually can run a fiber to your house? They can't in quite a lot of places but will happily tell you anything to get you to sign up. Even if they can, a month to get that set up is optimistic. Mine was a several months long ordeal of several complicated layers of incompetence. I know I sound crazy and bitter, but you'll understand later.
Anyway, BT can also sell you a real fibre connection and may be more inclined to talk to you. Unfortunately, they will probably be even more money grubbing and incompetent than Virgin. Plusnet are actually owned by BT but are pretty good. Not sure if they offer actual fibre.