I've taken the transfers off and booked car hire!
14 day car hire in a Chevrolet Colbalt (or similar), 4 door, with a full tank of petrol and the young driver surcharge included, for £373! A bit more than I was quoted before but that one was a two door :S
Paid £35 deposit today so have £338 left to pay on that.
I've saved £100 from taking the transfers off so that's brilliant. Only paying an extra £273 for fully inclusive car hire which is an amazing price!