Current requirements, which I do not see changing are:-
Passengers are allowed if from the same household or support bubble. The definition of a passenger is someone sitting in the passenger seat. So that excludes “mates” or the driver three garages up that has a really nice car.
Extra drivers are allowed, but the car must be sanitised between each driver. and a maximum of 2 This means using an antiviral cleaner on the touch surfaces. Again, even if you are sharing the car, it does not mean you can both be in it together if you do not fit the passenger criteria.
You can have essential support crew, meaning people needed to run your car, but proper (and well documented) social distancing must happen which means face masks, properly worn in all areas where 2m distance can not be maintained. Essential support crew does not mean a bus full.
There are no spectators, which sort of by definition is someone wandering round lots of places.
Tuition is now allowed, but instructors must be ARDS licenced, so again, not your mate, and at all times while in the car face coverings must be worn correctly, not like the dickhead I had in car at Silverstone on Saturday that thought that as soon as he was in the pit lane he could pull his balaclava down to talk to me. Again, touch surfaces, should be cleaned before hand.
I am aware of various opinions on social media driving groups who think it is all pointless and even those who suggest ways around this. Someone asking recently to book their excess additional drivers with other people who didn’t have additional drivers.
We take it seriously, as do MSV, who are Covid Secure venues and so are policing this properly.