Did you ever visit the Metrodome Leisure Complex in Barnsley? It's right next to the football stadium. I went there often in my teens, they have some proper awesome diving boards there, swimming pool wise, i loved doing somersaults off the middle diving board, and jumping like a madman off the top platform. they have 3 flumes including the blackhole, used to have competitions for time and speed as it records the time and speed of your shoot. also they had this bowl-flume,, which is like a flume leading into a enclosed bowl with a hole in the bottom, shoot into it, spin round for ages then drop out the bottom. I remember trying to stand up inside it while trying to grab the pipes around the edge, which was pretty tricky. It has a good/decent leisure complex at least, great for swimming.
ther is an airport here in doncaster now, the closest one you will get to Leeds, I would happily drive you up in my car