We understand how important your vehicle is to you and we strive to provide a service that is second to none at a cost that will not break the bank. Based in Harold Hill, Mastertec offers quality car servicing, repairs & MOT testing at competitive rates. Tyres, brakes, exhausts, air conditioning. 01708374222. We are a member of The Good Garage Scheme. We offer a free local collection and delivery service along with pre-arranged courtesy vehicles.