my insurance went up by a third this year, through absolutely no fault of my own.
I'm with Highway insurance through Greenlight, who were still the cheapest I tried. Chris Knott also use Highway for modified cars, so they couldn't beat the quote.
They told me if you don't have a year's experience with a powerful rwd you'd struggle to get a decent quote.
I have never, ever, got a reasonable quote through a price comparison site (and you get endless mithering from the companies that will actually quote)