I am sure I am being thick but am slightly confused. DH has a mirror on the helmet he uses on the tandem (mostly so he can laugh with DD I think).
I have always had a bar end mirror but decided to try a helmet mirror. He is away and I can't speak to him but I ordered this
reflex mirror
It is designed to mount on the left, not the right (discovered after it came) and comes from a US company where they obviously cycle on the other side of the road.
Will I be at a disadvantage with it on the left - I instinctively feel like I will.
I would try it out today but I knocked myself out coming out of my cellar on Sunday evening and am on light duties only for a week!