Think these are about right:
For comprehensive cover on cars < 60k miles excess (£0, 100, 250) £951 (£84pcm), £835 (£77), £670 (£65 guessed at this one)
For comprehensive cover on cars > 60k miles excess (£0, 100, 250) £2849 (£261pcm), £2447 (£224), £1939 (£178)
Hope this helps!