The car on the picture below is one of them and I have had this shot for ages, but have never seen any other image of it, as I have never found out which of the Mk8s it is. Yes, that is a wild supercharger on the Mini engine! Another Wade like this one? Anyone who recognizes the car at all?
UPDATE 2 March: Pete Crudgington thinks it's Ian Hall’s car: "He is still around racing a V8 powered Darrian and prior to the Davrian he raced a Mini Jem and an Arkley Sprite. Graham Boulter shared another picture of the beast: "Photo credit to Andy Smart, location is Prescott Hillclimb" It's added below.
That's a wild Mini engine with big supercharger! The car is a Davrian Mk8
Picture Jeroen Booij archive