The other problem is weather, you will probably not get all the flying that you want to do done and as you haveto cost in hotels, airline tickets, food & car rental. the cost of a lost hour of flying in the USA is quite high.
You're just trying very hard to sell your product, desperate for the summer? How many "extremely well-maintained" aircraft do you have?
I can count more European organisations renting broken aircraft than American ones.
How can the UK be cheaper when the fuel alone is already twice the price in the U.S.? Parts, maintenance, insurance all that is way more expensive in the UK.
The UK airfields are also very infamous for their huge landing fees.
Oh and let's not forget at least 15% vat.
The best argument is that I have yet to see an American going for hour building in the UK. The average rental price for a C-150 is 75$+ state tax (around 5%) in the U.S., around 39£/hour. In the UK you would pay around 75£/hour+vat+landing fees. For the same money you can fly 3 hours per day in the US, stay in a 5* hotel, rent a luxury car and pay flight tickets.
Aircraft shares or flight clubs can be very interesting if you find the right group and can schedule without trouble. The UK is the most expensive country in Europe for general aviation/training. There are countries like France and Italy where some flight clubs have very interesting rates which indeed work out to be cheaper for locals.