In order to begin to understand wave it might be very useful for a power pilot to experience it in a glider with an experienced mountain flying instructor. The best sites in the UK to give this sort of instruction are in Scotland so, Aboyne in Aberdeenshire, Portmoak in Fife and Feshiebridge near Aviemore. As others have said, you can get wave anywhere in the UK and some of the other gliding hill sites are good but none are as consistently as good as Aboyne.
It's a massive subject and even the experts like John Williams who flys from Portmoak will tell you that after years of exploring it, they are still learning - and he's a bloke who has flown offical 1,000 km tasks in wave within Scotland.
If you fancy having a look at how we see wave try these two youtube vids. The first is from Aboyne, the second (expletives NOT deleted) is from Camphill, Derbyshire.
YouTube - Glider returning from wave soaring flight through cloud
YouTube - Camphill wave