Harry Bloomfield wrote:
harryagain pretended :
Well, she shouldn't be reversing out.
She should either turn around or reverse in.
So she is at fault regardless.

Agreed! There were no head injuries and as already said he was riding on
the grass verge between road a pavement.

A likely scenario is that she had reversed out of that drive lots of
times, over that rarely used pavement and never seen anyone on foot or a
bike, so why bother slowing down or looking?

We all see what we expect to see. Behave unexpectedly and you risk not
being seen.

Tim