 It monitors combined sales of cars in the UK.Each year in May, it holds the SMMT Test Day for invited motoring journalists at General Motors' Millbrook Proving Ground at Millbrook, Bedfordshire.Aside from the Secretariat, who run the organisation on a daily basis with around 80 staff in 13 departments, and the Executive, there are many working groups and technical committees for trade sectors, and for research and marketing topics in the car industry.