Agra, Farnborough "I'll lay money that some of them ('big civil aircraft') are close to the edge of the safe flight envelope and almost certainly outside the manufacturers in-service operating envelope."
You would loose your money; excepting some pitch / bank limits.
Farnborough flying is (was - getting old) tightly controlled being overseen by a flight control committee - test pilots or similar professionals. The committee updates the overall risk assessment based on previous and similar shows.
For all public displays, each pilot, aircraft, has to be approved for all options of good / bad weather routines, usually two flights. Individual pilots would have a 'mentor' of relevant experience according to type. Preflight briefings discuss the flight mechanics of manoeuvres and how they relate to operational performance, and for new aircraft what has been tested so far. Each display would be assessed by 3 or more of the committee.
Debriefings for practices, approval, and show-day displays are held in private, generally one to one. In some cases suggestions for change are made.
Very rarely, specific manoeuvres would not be approved.