My Father passed the Course in 1940 - mind you; he had an incentive.
Failure would have meant a return to the Pioneer Corps and his role in case of Invasion. This, quite simply, was - in the event of a NAZI Invasion - to run unarmed down onto the Beach and throw himself across our barbed wire so that our Forces could run across his body to counter-attack.
He later considered the Parachute Regt - but the Recruiting Officers were a Major Pine-Coffin and a Capt Blood.