biscuit74,
You are not alone in your opinion. On page 218 of the Shoreham report it states:
"Safety Recommendation 2017-002: It is recommended that the Civil Aviation Authority require pilots intending to conduct aerobatics at flying displays to be trained in performing relevant escape manoeuvres and require that their knowledge and ability to perform such manoeuvres should be assessed as part of the display authorisation process."
Hopefully, the next edition of CAP403 will include this.