We did have a conversation when we paused for a 'Catrike+Valencia at the Givendale sign' photo-opportunity
about what would happen if Arch's cunning molished-from-velcro handbrake went wrong before she got clipped in and ready to set off and she essayed a descent of Givendale Lane backwards, using the view afforded by one small rear view mirror. The sign isn't actually quite at the top of the optical illusion you see, but it's a good excuse to stop
I did offer to go and stand slightly downhill and catch them if the hill start went wrong!
By the way, did we mention the scones?