I'd usually recommend Direct Line on price alone but since this weekend I'll recommend them even more strongly.
Yes, they were the cheapest by a long shot but they also implicitly cover trackdays. I called them on Friday night (the day before going to Bruntingthorpe) to discuss the wording on my policy and they reluctantly had to confirm that I was covered. She explained that, once someone enquires as to the true meaning of the small print, they are obliged to tell them they are covered.
And this was all followed by a letter dropping through the door this morning with words similar to this is to confirm that, under policy no. XXX, you are covered for trackdays . I hadn't asked for the letter and had to re-read it to make sure I wasn't dreaming. The girl on the other end of the phone was also a car nut and we chatted for while about that ... maybe that's why (?)
Ian.