I've turned up at MSV track days in the past without a license at all, it's a bit of a pain but the track owners will call the DVLA (with your moby - so make sure you take it and it's charged) the DVLA will ask you various questions, nothing too difficult, name, address, DOB etc and then ask to be passed back to the organiser and they will confirm with them that you do indeed have a bike license.
I would check with Dibble, Apex/Whele etc on this though