What is the best way to insure a car when you own moe than one?

I own one car and insure it through Esure. However, I’m purchasing a new car and keeping my old one. I need to insure me new car but how do I go about this because they will ask for proof of by no claims, which I won’t have until me policy is up (not until Dec). Thanks.
I have four years no claims. Sorry for confusion.

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