more research. k0 doesnt exist, people just call them that. basically it's just a cb250, later ones had the k numbers.
Phoned the guy I bought it from, he says put a battery in it and it'll fire up (a workmate i've bought from before, no reason to doubt him)
Is what i've got rare? It's a keeper, i like the look of it and wont be parting with it.
cheers
Rab