Does your car insurance go up when you pass the test?

I'm holding a provisional licence and want to buy a car to practise for the test. And I thought I had found the car I wanted. But then, when looking for insurance deals, I was told by a friend that I may have to pay more once I pass the test.

If this is true, then I don't think I will buy a car now. My question is : is this policy enforced by every insurance company in the UK?