In the Andy Fenn round, I was asked "Ever rode a GT?" I answered yes, because I guessed that a glance at the GT box on PCS would be part of the elimination process (it would be for me).
But I think that no would have been a more honest answer: if somebody is asked whether they have run a marathon, they should not say yes if they got kicked off the course for using a scooter after 19km.
So in future, I will answer "Has he/she ridden...." as "Has he/she ridden ... in its entirety, to the finish". I note and commend the phrasing of DJ Sprtsch's question re Tro Bro Leon above, and employ an alternative way of avoiding ambiguity below.