Tiff, with the old black shed, i had a policy with Adrian Flux, all mods declared and track days included. Was about £800 for 3rd party which I didn't think was too bad.
The cossy is fully comp through dominion, agreed value, and this covers RSOC track days only. When I did redline in november i spent an extra £90 insuring basically the shell for £7000. It would have been £150 for the whole car just for a poxy day.
You then drive home without a scratch and wonder why you bothered, but then sods law something will happen the day you don't insure it. Can't recall who I did it with but they were a specialist for track/competetion cars.
Paul