Air Display administration:
The airshow organisers would have a copy of the following:
Pilots Medical
Aircraft Insurance
Permit to fly/ Airworthiness confirmation.
CAA Display Authorisation
***The above is sometimes combined into a display pilots self certification, but even then dates and license numbers are documented.
Next of kin POC
Display ribbon diagram. (display routine/ notes / pictorial diagram)
A DA once issued does not require another check as long as currency is maintained. Minimum 3 displays or practice in the last 30 days. In practise, display pilots mostly lose their qualification towards the end of october after the Duxford end of season display. This includes BBMF whose aircraft enter winter servicing at about that time. A DA may not have been issued on the specific aircraft type so a JP Based DA could be used on the Hunter by a Hunter qualified pilot. This means that for example the RNHF Swordfish display DA may be issued after display in the RNHF flights Chipmunk. Essential as Swordfish winter servicing usually runs late into the spring.
IMHO the regulation in place was sufficient. It will be difficult to undo yesterdays regulation and will cost the industry operators / owners business. A Meteor et al in horizontal flight will not justify cost in anyones budget.