The seventeen first-class counties were joined by five Minor Counties: Buckinghamshire, Cambridgeshire, Durham, Oxfordshire and Wiltshire. Teams who won in the first round progressed to the second round. The winners in the second round then progressed to the quarter-final stage. Winners from the quarter-finals then progressed to the semi-finals from which the winners then went on to the final at Lord's which was held on 2 September 1972.