Thanks @Jak jak (is there a way to tag people? If so, please enlighten me...)
To add to @raddys' info re scrutineering, the regs state the following:
8. The event will consist of one class and is open to road equipped cars of any age with any capacity produced by Toyota (cars entered may be checked with the DVLA website, whose records will be deemed final for purposes of eligibility and insurance. PLEASE NOTE – Road equipped means that cars must be presented in a condition in all respects (including MOT if required for age of car, road legal tyres, exhausts, lights, etc) that enables it to be legally driven on the public road. Tyres may not be changed after the car has entered the circuit.
20. PREPARATION - CARS
All cars must be prepared to a condition which is safe to compete. Cars which are found to leak ANY fluid during Scrutineering or on the course will not be allowed to compete until the seal has been repaired.
I think the suitcase check is one of the tests - if they fit, you pass, and if they don't you start the day with penalty points (sorry MR2 owners - you should've bought a Supra!)
Bit more info on what the day involves in the report on this year's event at the Toyota blog: https://blog.toyota.co.uk/first-toyota-parallel-pomeroy-trophy-huge-success
Any questions, don't hesitate to ask in here or PM me. Great to see a list of attendees developing too!