I would like to hear how the GA pilot felt about this whole incident. He turned slightly behind the departing aircraft so probably felt well clear of any conflict. If he had concern he would have made a much more aggresive turn. He was above the wake so he was fine. In the US maintaining visual separation removes minimum separation. I have had aircraft overshoot and reintercept the localizer below legal standards so just told approach I had the traffic and would maintain visual behind him to help the controller out. Now all you hope is he clears the runway for you when he lands.