There's apparently a CCGT in Plymouth and small
hydro plants in Devon/Cornwall- coincidentally I visited one at Morwellham a few weeks ago, built in the 30s to utilise watercourses dug for previous generations of mining. That's not mentioned on
the wiki list, nor is the one you mention- do you have a name?
ooh, tantalising, I really want a better grasp of how this all works!
Thanks for the sources, I'll have a look. I've been trying to make sense
of this, but it's a bit too detailed and doesn't quite explain enough for background understanding.