England’s winless and error-prone Under-21s boarded a private plane for home on Tuesday while Romania, Germany, France and Spain prepared for European championship semi-finals. Players dispersed on arrival in Birmingham but Aidy Boothroyd could not escape so easily. The inquest into what went wrong throughout England’s 12 days in Italy and San Marino is about to intensify. The England head coach and his back‑room staff will convene at St George’s Park on Friday for a debrief into a tournament approached with high hopes but ruined with two defeats in four days. Should their diaries allow, Boothroyd will also hold talks with Gareth Southgate to hear the senior manager’s opinions on the development – or lack of it – of the next generation of English talent. As Boothroyd admitted after Monday’s 3-3 draw against Croatia provided a suitably careless end to the campaign from an England team that led three times: “There is plenty to talk about.” Southgate and his assistant, Steve Holland, were in Cesena to watch England fall to defeat against France and Romania. Les Reed, Dan Ashworth’s replacement as technical director at the Football Association, witnessed all three group matches and confirmation of England’s inability to iron out…