My Classicline policy, which includes UK track cover, came in around £50 up on last year, just over £600.
Not planning any track days over next 12 months, so went with Aviva, £300. Fully comp cover in Europe too, which is rare.
I used to do this with the Cossie every year, and get a refund on the annual policy whilst it was laid up with the cover reduced to F&T only, which was a blessing when we had a house fire a few years ago.
I haven't found a company since that offers this unfortunately.