Flap62
From your uninformed comments, you obviously have not participated in a Duxford display. I displayed at Duxford for a number of years until the aircraft was recently sold.
In the civil world it is obviously not possible to carry out the massive amount of time and finance that the military expend for their dedicated display performers.
Civil participants are governed by the UK CAA and all pilots are covered by display authorisations, including arrangements to cover visiting foreign aircraft/aircrew.
Very thorough aircrew briefings do indeed take place before every Duxford Display, especially due to the number of foreign pilots involved.
(In my opinion the air safety cause has not been helped by the enthusiastic grounding due 'paperwork' of many of the Duxford aircraft over the last three years by a particular CAA Surveyor, requiring the participation of more non local aircraft/aircrew.)
The run and break at Duxford is briefed, as it is non standard. Due to noise constraints the village on left base to R24 has to be avoided. The initial break is to approx 90 deg and not a continuous turn to downwind, to extend the circuit around the village.
This may turn out to be a factor in this event.