Just an update for you... Ended up there was a nail sneakily tucked away in the wheel which I couldn't see, was front nearside.

Took it to ATS who Arval have some kind of deal with, the buggers wanted to swap ALL *4* tyres with Michelin instead of the Bridgestone Poteza I had on there originally... Luckily as I've not done loads of miles the ATS guy managed to negotiate with Arval for a replacement... ATS were good though.. Took them about 20 minutes, and had one in stock at another branch so just dropped in next day. Oh, and really impressed with the AA, they sent a dude round on a Scooter (im in sheffield atm) who put the spare on for me! I wasn't going to get myself all dirty changing a tyre in the work car park :/.