I would have suggested Donington, but I think it is closed for the F1 upgrades isn't it?Here's a link to the UK courses and looking at it Rockingham would be a fairly central course to meet at.http://www.barc.net/AMRCO/index.htm#map
There are track days on Monday 25th and Saturday the 30th of May @ Goodwood but that might be a bit too tropical for you.
Goodwood is about 5 hours for me lol..
Old airfields are poo, you need some hills/camber/blind bends.Oulton or Donny FTW, although I still prefer Oulton - home track and all http://www.motorsportvision.co.uk/oulton-park/trackdays/event-details.asp?ProductID=5316