Release date unknown.

AEC did not have the production capacity to meet the replacement requirements of London Transport, so an agreement was reached between AEC London Transport and Leyland that the latter should supply a proportion of buses.The major requirement was that the chassis must be able to accept the standard RT body without serious alteration.Leyland offered their standard PD2 type steering, front & rear axles and revised 0600 engine, the transmission was to be supplied by AEC.Production began in 1948 with bodies by Park Royal.All Ledguard's RT types were chosen for the roofbox body, of which the main destination boardmade it suitable to rebuild to the Company's standard destination display.