The CAA response (dated 20 Oct 2009) was as follows:
Recommendation 2009-052
The CAA accepts this Recommendation in so far as, since the start of the 2008 display season, it has been a requirement for both display pilots and display organisers that any large formation or set piece display must have been specified prior to the display. The requirement to practice the display sequence is already covered in CAP 403, Ch 6, para 5.
However it is believed to be impractical to require that individual civilian display pilots specify a display sequence prior to the display and are then not allowed to vary it or modify it in any way later. Circumstances and weather conditions on the day of the display, such as time pressure in the display programme and wind strength, may make it safer to vary a display, for example by removing one or more manoeuvres from the approved sequence or by flying a flat display, rather than adhere strictly to the display originally specified.
https://publicapps.caa.co.uk/docs/33/factor200910.pdf