Adult KMX Kart, not a current model, but spent it’s life in storage and hardly been used, hence almost immaculate.
It has disc brakes all round, 24 gears and is rated for on or off road use. Adjustable crank boom means it’ll fit pretty much all adults, unless you’re a midget or a giant (I’m 6ft 1 and there is still some adjustment for taller folk).
These things are great fun and built to take abuse.
Closest equivalent model is £1200 new.
£475 ono delivery to be negotiated… can deliver for fuel cost, or approx £40 with courier