CSL Insurance

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I'm weighing up the prospect of upgrading to a CSL & am searching for insurance quotes.
The cheapest so far is around £1,100 fully comp.

This seems expensive, considering that my insurance on my M Coupe is ~£500.

Does anyone know of a specialist who might be able to beat the 1k barrier?

fwiw:

29 y/o male
10 yrs+ NCB
0 points/claims
S/P/D cover

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group 22?
I thought the highest group was 20?

in that case I suppose £1100 isn't *too* outrageous