Flying Dodo
It'll soon be summer
That is the issue.
The report I read described it as "illegal" because of this restriction
The video is here:
The alleged incident is on 4th October and hence after the issue of
Civil Aviation Authority Safety Notice Number: SN–2015/003
Arguably the manoeuvre was not specifically banned, but it depends what you define as a "high energy"
The last flight of the Vulcan was not however an air display so that specific Safety Notice isn't applicable. The fact that the Vulcan isn't cleared for aerobatics is covered under existing flight restrictions, but there'd wouldn't have been anything stopping the pilot pulling their normal wing over & high energy flight pattern.