MK is the best indoor slope I have been to, Hemel isn't bad. But as you say forces you to learn on the crap stuff, when you hit your first mountain Dave you will be in heaven!!! There is nothing better than the real thing, but you will be so glad you got all your basics out the way on the hard stuff.
Any trips planned yet?
Any decent slopes in or around Leeds? How late do they stay open of an evening? Any pointers to finding discounted tickets or packages if you were planning to hit these indoor slopes, say, 15-20 times over 5 weeks.
Due to the rising cost of ammo, do not expect a warning shot! Sorry for the inconvenience.