I believe the number is 4. Bristol Morgan Caterham and MacLaren.
AFAIK Bristol's long gone
edited to add.....
The company suspended manufacturing in March 2011, when administrators were appointed and 22 staff were made redundant. In April 2011, the company was purchased by Kamkorp. Since 2011, the company has restored and sold all models of the marque while a new model is being developed.
https://en.wikipedia.org/wiki/Bristol_Cars
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