After some advise on insuring a second car

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Before I get my hopes up and start looking for cars ect can anyone give me any knowledge on adding another car to my policy?
Plan is to add ninja car to my 205's currant policy, the car will have 1/3 of the power of my 205, and will be the main car, the 205 will be a weekend car.
I just wanted to know people experiences with insuring another car as I won't have alot to spend, I'm hoping it will even go down as the car will be a standard snail compared to the 205.

Thanks.