Gareth and I rode up to our local bike cafe this morning (Cowbridge Common) and I got to ride the CB on the return journey. It is bloody fantastic. Featherlight clutch, sweet gearchange, strong motor and lovely handling. I'd forgotten how good a sorted CB250 could be. Yes it's a shame it's going but someone will get a blinding bit of kit for their wonga (imho).
I think it would just always annoy him to see the bike get dirty and start to age and wear again. I think, in this case, he got a lot of his fun from the rebuild and he wants to turn his attention to other projects (and bikes).
Cheers
GC