Don't know about UK rules, but in France it's a microlight licence. That may change, we may go no licence required. You don't need to know a lot about the rules, because basically you don't really go anywhere with them. I am learning to fly one with a little wheeled buggy, as I am not built for speed on legs

Fun, noisy, and totally useless as aviation, but then a hot air balloon is pretty useless too. You need a biggish car boot unless you really take it to bits, and the only tricky bit is the take-off. Get it wrong and goodbye propeller at 250 euros a go

Once airborne it's a non descending parachute, landing like a parachute too.
Solo training, which is fun!
Give it a go, why not?