The dealer can do 7 day drive-away - presumably with Aviva via HPI - and that should be sufficient to tax the car. You then need to put the new car on cover with a new insurer from the date the 7 day insurance expires.
It is almost certainly not worth transferring your old policy to your new car as there will be admin fees and these will more than likely offset any saving you would make on the 12 day run-off of your old policy. Just let the old one expire and tell them you don't plan to renew so they don't keep your direct debits going.
Before you buy your new policy read my upcoming post on "12 tips on saving money on motor insurance" which I am writing now and hope to add tomorrow morning.
Best wishes
L
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