Marlborough Skoda have just informed me that my car will arrive at least 4 weeks ahead of schedule, so whilst it will be an 07 plate, it will be great to have it early.

Did I read on here that 1 weeks insurance is available from the dealer? I won't have much time to dispose of my old car, prior to my new arrival and I don't think I can insure two cars on my policy.

Yes you should be able to get an introductory insurance offer with your car.