When I was an ATCO student in the early 1980s, having gained my airfield rating I spent 90 days at Stansted. ODO was a common practice which I had never seen before. ILS approach rwy 23, departure on 05. The method as I remember was to clear the departure for immediate RH turn after departure, ideally when thru 500' while the arrival was checking the outer marker. It scared he s**t out of me as a trainee tower controller!! Hopefully a practice that is long discontinued.