I was there too - so far as I recall there were 21 airworthy Spits (20 flew the day I was there as one of the BoB pilots was sick) which was most of the UK ones plus a couple of European interlopers, plus five or six Hurricanes - two from the BoB, one from TFC, one from Shuttleworth, one from RAC and one from Hurricane Restorations. Great line up!
Might be an interesting exercise to figure out exactly how many of each are airworthy at the moment... if I get some time tomorrow...
Treadders