As a local resident I would support a well constructed letter that could outline:-
1. How this meet is to be policed.
2. What strategies will be put in place to ensure the local residents peace and quiet at all times during the meet.
3. What proposals would be implemented to ban anyone that violated driving laws and how would they be enforced.
And finally a strong case as to why Brands Hatch should be used and not any other venue/car park.
The major problem is always going to be the Loose Cannon element, you could have 300 cars turn up and 299 drive like there 99 year old grandmother is sitting in the passenger seat when they leave the circuit. It will be the one who thinks it doesn't apply to him that will spoil it for everyone. (which is where it's at now)
MotorSportVision have been putting a huge amount of time and resources into building a good relationship with the residents of West Kingdown and you will need a very strong case for them to put this relationship in jeopardy.
Having said that I would be happy to lend this my support once the ground has been cleared for liaison.