With apologies to Andy Smith, I got the ownership of Margaret wrong in that lovely old picture. Andy's reply to 'where?':-
I don’t know to be honest but as she was in Taylor Bros ownership and with Georg Swann at the controls I would say around the Wimbish / Thaxted? Saffron Walden area as for longer journeys she was precariously carried on a small four wheeled lorry (I hate to think how they loaded and unloaded on the rally field!).
To hide my embarrassment, here's another picture, obviously taken on the same occasion.
Also one of Margaret shrunk to 3 ins scale, having won a well deserved major award at the Model Engineering Exhibition.
Bill.