Dunno but I presume it's to do with their hire agreement.
I did level 1 last year, am doing level 2 at Rockingham this year on 6th July. No cover if you fall off but unlike a track day you're not riding close to 100% - if you did you wouldn't learn anything. In fact most of the day you're not allowed to use the brakes. Level 1 seems to cover Noddy stuff but the group then went on to prove that most of them were doing most of it wrong, or at the very least had a poor understanding of what they do. Expensive but highly recommended.
Dunno about the Southern circut but Stowe is about 5 bends, rubbish for a track day but TBH fine for level 1 as you're concentrating on bike control not learning a track and going fast. The first bend is like ice if it's wet though. Never mind aTravelodge, stay here
www.theoldpostcottage.co.uk Rockingham is a great track but if you're a newbie I'd stick with Stowe as it's your technique that should be filling your thoughts.