Millbrook Proving Ground

Due to the geographical needs of a full testing centre, including both hills and flat land, the traditional choice of a former Royal Air Force airfield was ruled out and many sites around the UK were surveyed before the location at Millbrook was decided upon, especially due to having the benefit of being close to Vauxhall's production site at Luton.

[1] Construction of the Proving Ground began in 1968, and once the facility opened in 1970 it acted as the testing site for many European GM models from, among others, the Vauxhall and Bedford companies.

With the sale of Lotus in 1993 Millbrook was transferred to GM Holdings UK Limited, as an independently managed company which diversified into all aspects of vehicle testing including emission control.

[4] In December 2020 it was announced that Millbrook would be divested from the Spectris portfolio of companies and acquired by UTAC CERAM for £133 million.

The most prominent are the: The proving ground maintains a high standard of security and secrecy to protect the commercial interests of its customers.