Brilliant! I've added it to my favourites, thank you.
A couple you might have missed - Hethel, Scarborough Olivers Mount - Isle of Man - and perhaps add Santa Pod and York dragstrip. Although that might lead you to adding hill climb venues...
Magnitude Events do Classic car track days at Hethel for 20 years old + cars. I am actually doing one on Sunday..... Hethel was completely resurfaced three years ago, now 12 metres wide F1 race spec smooth tarmac.