Just another thought.
Looking at the X bus page this morning, I guess I had pressed SET for the neutral , the button for which is just below the reverse box so that when pressing the correct SET button REVERSE is obscured by the finger pressing SET ! The button I should have pressed is the SET button ABOVE reverse.
An expensive human factors error causing my first crash for many years.

Thats aviation, you never stop learning!

Hope this may may just possibly prevent someone else making the same mistake.

David G.