Shopping on Ebay again. Decided that the Michelin Pilot Supersports were great and really gave the car loads of grip but on a hot day like Sunday and on a faster track they would probably get ripped up quite quickly. So decided to get some proper track day tyres and put the Michelins on another set of wheels for tracks where it's either wet or cold. Found some barely worn Medium Hard Yokahama A048's in a 235/40/18 size that were from the last batch of road legal tyres they made. Despite being a 235 tyre they have virtually the same width of tread as the 245 Michelins. They are directional but unlike most directional tyres you can turn them on the rim so if the outside edge wears a lot you basically get two tyres out of one. They normally come with 4.7mm of tread as new, 4 out of the 5 tyres have between 4.5 and 4.7mm of tread and the 5th 4.3-4.6mm they have only done one track session apparently. Reviews on these are pretty good and they feel suitably sticky with very stiff side walls on the tyres, almost like a run flat.