Right after a bit of faffing around, told LV what I wanted to do. Spoke to Brentacre and went through the legal option (I paid the legal premium) who've directed me to Winn Solicitors. Not sure if it was the right option but they're aware it's to reclaim the excess.
EDIT: Looks like they're one of those "no win no fee" solicitors.
Winn solicitors are a big firm in the North East I think? Every solicitor is a "no win, no fee" solicitor as after 1st Aprl 2013 the success fee element of the CFA switched from the Defendant having to pay it to the successful Claimant ie if you win, your solicitor charges up to 25% of your damages, if you lose you pay nothing.
However, as your claim only comprises property damage in the form of the excess this agreement will not apply and it will be governed under the terms of the arrangement between Brentacre and Winn's.