Well double may have been a slight exageration; Currently 1hr Dual at TPC is £140; Cabair in 2008 was £216. And i can only imagine the price have gone up since then. They also charge you as soon as Chocks are off; meaning you end up paying full whack if your sitting waiting to get airborune for 10 mins; whereas TPC only charge you 5 mins either side of Takeoff and Landing.
TPC provide full ground briefings the same as Cabair.
I was on a Bucks Uni Course back in 2008 Cabair charged me £4855 for 15 hrs in a PA28, Ground School for exams and books. Rip off merchants' numerous candidates on the course are unhappy with them.