For my 2009 Toyota Alphard with a disabled access seat, Advance Insurance quoted £861 with 5 years NCD and my wife as a named driver, I went for it. I pay £450 on Mercedes B180 with everything else being the same (postcode with high car thefts). Adrian Flux couldn't quote for some reason, Mark Richards quoted £1680 blaming my postcode!! I will look for a better quote next year, but wanted to grab the first reasonable quote this time.
Thanks all for sharing information, very useful.