Hi Ivor
I restored my C9/B about 15 years ago, but just haven't been able to do much with it since. It lives in the Tank Museum at Northwood, on the Ilse of Wight. I think I met the ex owner of yours years ago when he was first rebuilding it, would his initials have been T. F.
Put by somewhere I have the No2 Key card that will have the displosal date and depot for your vehicleif you havn't got it already.
All the best with your task.
Gareth