my car insurance is up for renewal and my current insurance company's renewal quote is astonishingly out of line - £800 a year. No thanks. I have a quote of £530 from Tesco and £580 from Sainsburys. Anyone got any experience of these?

Plus points on Sainsburys; they are giving me double nectar points for 2 years and i am a sucker for anything nectar related. It really does tap into my gamer mindset.