The US prices are only this low at the moment due to the $ being so weak. I don't know exact historical rates but two years ago £1 would buy about $1.5 now it buys $1.75 a 16% increase. On that basis 30 minutes was £220. Any way with two tunnels in the UK no one should have problems booking time and they are the sort of thing you can go an visit regularly particularly over winter meaning that you can continue to build skills rather than making one big effort maybe once a year.
Also on pricing both tunnels are a lot cheaper and seemingly better 'quality' than Aerokart.
Airkix - skydiver introductory rates sep05.pdf
