 The BTC transferred control of South Midland to Thames Valley Traction, and in 1952 transferred the United Counties service to South Midland.During the 1950s and 1960s, South Midland ran coaches between Oxford and London about every hour, alternating between the High Wycombe and Henley routes.Non-stop coaches started in 1963, reducing the journey time to 2 hours 15 minutes.