Do you have to have a seperate policy for each car you own? Or can you combine two cars on one policy? perhaps/hopefully keeping your premium the same, or maybe even reducing it?
Essentially, it should be reduced right? If you add another (cheaper) car, which you are quite likely to spend most of your declared annual mileage in.
if not, then its daft, though i somehow expect you have to pay full whack for another car. Car insurance is an unreasonable beast.