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Yes that one's mine, but most companies I know that hire Caterhams for track use would be fine with on a wet day like that. But your car will slide around very nicely in those conditions, it's a great tool to learn with.

That's one hell of a braking zone. I can't think of another track that would be that brutal on brakes. Ignore that, missed the supercharger part in the description. The pedal going to the floor suggests that the brake fluid boiled, fluid doesn't compress, but the "air" after it boils does resulting in a very long pedal. Did it remain long /spongy afterwards, if so that's probably the cause. If not, you probably overheated the pad material which would have resulted in it having a huge drop in friction so pushing the pedal would result in far less braking force. New pads will have a large impact, the stock ones just aren't up to heavy track abuse, particularly in a super/turbo car. I think of those that track the car and have gone the FI route they all have a BBK. The dot 5.1 would help prevent the fluid boiling, depends which of the symptoms you had. Unrelated, but if you don't have an oil cooler you may want to keep an eye on oil pressure /temp when on track if you don't already.

Get yourself on a cheap track day in the winter and pray for rain. Everything happens at a much lower speed but you can practise losing control and sliding the car around without too much to worry about. The best bit is that when something goes wrong on the road you'll be much better prepared to deal with it. This was some of the most fun I've ever had on track, despite getting quite wet!