I don't know about by how much, but I've had a couple of years of decent rates with Aviva - Polestar (225bhp) and named driver on provisional license.
The trick with Aviva is to get them to match/beat whatever other quote you've had, but before you purchase the quote do their "aviva drive" app, which monitors your driving for 200 miles. Once you have got a top bracket score on that they will reduce your insurance premium (minus any extras eg legal cover) by 20%, no questions asked (if it's over £400 - there's brackets)
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