Nigel, you were there early !! - well before I arrived at around 10 as all those cars were parked by then, only few drove in after that, an MGB Roadster.
The Mini with Race Number 43 belongs to Donn White who bought it New in 1973 - he repurchased it 17 years ago had it restored and has done a couple of Targa's and other competition in it.
It had an information board beside it - as seen here.