Allen - Amanco - Armstrong Siddeley - Bamford - BSA - Coventry Climax - Coventry Victor - Crossley - Douglas - Enfield - JAP - Lister - Lister Petter - Mirrlees - Norton - Petter - Premier Gas Engine Co. - Ricardo - Ruston - Ruston & Hornsby - Sturmey Archer - Tangye & Co. - Villiers - Wolseley