Andy, Many thanks for the information.
I have had a look and found information on the Festival Auto Culto. I have found an advert and have a photo from which the advert image was taken. I’ll attach both. I’m sure that if I look harder I’ll find some other manufacturers that attended.
The archives relating to the Festival are held by the National Archives at Kew, I’d like to have a look at those!
There are many references to horticultural groups and flower shows throughout the country having Festival of Britain theme events and shows.
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