>>150245071
Not sure how different things are across the pond, but I cannot recommend grassroots club level motorcycle racing enough, it's unreasonably fun, not actually that expensive, and very easy to get into. Go get a bike that fits into a common class, either a Ninja 400, RC390, or SV650. Take a couple of trackdays with instruction to get your feet wet, and go do it.

Check normiebook or any kind of local sales place you guys might have and look for preprepped racebikes, there's no such thing as a turnkey race/track bike, but it'll be close and they're dirt cheap. Some guy in my org was selling a prepped, running SV650 for $1k to any new racer last weekend, good dude.