The problem with display flying as with any other types of "demanding" flying close to the limits, you need to be doing it almost full time and be very current. Both with the maneuvers and a/c type.
The CAA plan to implement "higher qualifications" is certainly a step in the right direction.
Takes a lots b***s to be a display pilot, as if you screw up, the world is watching. Everyone's worst nightmare is to involve the innocent, when you screw up.