"Well that is about £500 per hour for a winch launch flight (average flight 6 mins) and about £ 360 per hour for an aerotow (average flight 15 mins) ....what you mean its pretty cheap??"
I've no idea how you come up with those figures. A winch launch is £7 at my club, flying is 40p/minute, if there is no lift a circuit is 5 minutes on average. So, 5 minutes flying = £7 + 5*£0.4 = £9. 5 minutes is 1/12 of an hour, so per hour that's £108. A 2,000' aerotow is £23.30, that gives in the region of 20 minutes flying, so the total is £31.30 - under £65 per hour.
And the per minute charges are capped at £60, so the maximum cost for a winch flight is £67 and an aerotow £83.30.