Just to add to this, here a few more thoughts on the day:
I went in expecting to absolutely fall in love with the track but seeing 12 people fall (who knows how many fell that I didn't see as I stopped watching the other groups later on in the day) and the people from the group above being dumped into the beginners group (the cause of quite a few of the accidents) put a bit of a downer on the day.
Having said that I really learned a lot and the tuition that came with the bike rental has really improved my riding. There were six of us in a group all renting R6s from the same company and all of us learning and jostling for overtakes was brilliant. It was pretty frustrating being quicker than the other beginners in the corners only to have them nail us on the two long straights in their ZX10Rs and GSX-R 1000s though
I am really keen on renting a bike at another track to see if I get the bug, but two of my mates are definitely taking up track biking after that first taste. I'm definitely not taking my road bike though after seeing how many people crashed because others either ran into them or overtook just before a corner and then slammed on the brakes forcing a rear-ender.
One thing I never got the hang of though was doing safe overtakes. Unless someone was a lot slower than me I really struggled to overtake them as their lines were often unpredictable and I wasn't that much faster that I could avoid an accident if they suddenly changed direction unexpectedly.
It really is incredible how hard you can brake and how fast you can corner with all that insane grip on a track.
So first please allow me to brag:
I did a track day at the Stowe circuit in a Formula ford, racing against 7 other people I think all in the same car. I came out at the end of the day with the fastest lap of the day, but by nearly 2 seconds.
I eyed it up on a previous trip to Silverstone and told myself that I reckon I'd be good at it, said the same thing to the misses as well. I am not confident (aragant?) in myself generally, but behind the wheel I am, I would like to say, that given the same oppertunities that some of these Forumla 1 drivers have had, I would be as good. I am also completely fearless on the track in a car.
I can uncategorically say, that having been a motorcycle rider since 18 (I am now 34) that I would be absolutely hopeless on a motorcycle on a track, and there is little to nothing that attracts me to doing it, at all!!!
...good on you for wanting to go back!