Having done this on a few occasions (not knockhill),
The tips I would give you is upgrade your pads at least. I'm a fan of ferrodo DS2500 but they are not cheap. Whatever you do take the old pads with you in case you cook your pads on the track. Of course you'll need the tools to change them if you do and want to drive home!
The other tip is take an accurate tyre pressure guage. Check you pressure before you start and it's at manufacturers recommend level. After a couple of fast laps, with a bit of heat in the tyres check the pressure again. It should be approximately %10 higher. If less than lower the pressure by a couple of PSI. If it's higher than %10 increase the pressure by a couple of PSI.
It's all to do with side wall flex and deflection. To much and your tyres overheat, to little and handling will suffer.
HtHs
CtL
__________________
Conan (the Librarian)
Watch it if you dare
Currently,
2000 S8, Merlin Purple, Leather Pack 1, Winter Pack 1, SPAX adjustable suspension, AP Racing 6 pot front caliper, 385mm fully floating disks, EBC Yellow Stuff Pads, Black Diamond grooved rear disks and predetor pads, D2 Doctors Brake Block.
1997 4.2 A8SQ - the Projekt. 12 years and ongoing!
1997 4.2 A8SQ - Ming Blue. Restoration sat waiting; saved from the Scrapyard
2003 C5 Allroad 4.2Q - Cobolt Blue. Towing car. Laid up awaiting manual conversion.
2005 C5 Allroad 2.5TDi FE - Grey - Workhorse.
2015 Q3QS SLine - Daytona Grey. Lots of extras! Long Haired Admirals cutter.
Previously
2003 C5 A6 1.9TDI FWD - Loaner from D2 Doctor Lifex
1997 S8 - Ming Blue. Loaned out and written off. I loved that car. My first engine swap after cambelt failure.
1996 4.2 A8SQ - Ming Blue. 178k on a cambelt! Trader's 8. Delivered to A8Parts at Lifex.
2003 2.8 A8SQ - powder blueish. Fill in for a while. Sold on.
1998 1.8T A4 Avant FWD. Ming Blue (there's a theme here), PEX for the 97 S8.
And a list of non VAG going back 40 years before I saw the light. 
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