The bike is now at my brother's house being played with and kicked straight. He took the baffles out and cleaned them, but I forgot to include the keys with the bike so he wasn't able to start it today. He's got the keys now so I expect an update tomorrow am.
He also promised to check the chain and sprockets, but as the whole lot is enclosed he wasn't looking forward to that.
We were pretty 'impressed' by the fact that the carb is a push-fit in the inlet manifold

I guess it must work ok otherwise they wouldn't have done it that way... a logic I cannot extend to the braking system

I'll say one thing about the bike, there's not many bikes you can load into and out of a van single-handed.
GC