The members were chosen jointly by five "appointing trustees" listed in the Act: The chairman of the London County Council; A representative of the London and Home Counties Traffic Advisory Committee; The chairman of the Committee of London Clearing Banks; The president of the Law Society; and The president of the Institute of Chartered Accountants in England and Wales.
Medlemmerne blev valgt i fællesskab af besidderne af fem tillidsposter, som beskrevet i loven: Formanden for London County Council; En repræsentant fra London and Home Counties Traffic Advisory Committee; Formanden for Committee of London Clearing Banks; Præsidenten for Law Society; og Præsidenten for Institute of Chartered Accountants in England and Wales.