Just a brief update, the car has now been sat in the garage for at least 4 days without going anywhere, I pulled out yesterday and glanced at the lights when I got to my destination, both had condensation in them again.
The problem I got is that the warranty expires in exactly a months time, so don't really want to leave it want to make sure it's reported/dealt with under the original warranty before I put the extended warranty onto it and find that I end up having to chip in towards the cost as I'm sure they will end up putting some sort of excess against the extended warranty.
The car is due a service, so booking it in within the next couple of weeks, my local dealership has asked me to take a couple of pictures and email across which I will be doing shortly.