They are still in production in India, with some updates and modern options like electric start and 5 speed boxes, so most of the bikes were likely fairly new.
The fact they are still produced is a great boon for owners of the Redditch-built bikes, as new parts are available and they can make changes for safety, like disc brakes or 12v electrics with real headlights, if they wish.
Sounds like quite a trip, though.
Simon.