Thanks for the reply

In terms of the mechanism of the injury, bending my neck forward so that my chin is touching my chest is painful. It feels quite tight as if a muscle is pulled/strained and doing this is stretching it. I experience a similar sensation if I arch my neck backwards to look up but not to the same extent. I do not experience any form of discomfort if I turn my head to either side.

As I have said I have no real strength in my arm, the numbness is not extreme, mainly the tip of my index finger and a small patch on the back of the hand.

Thanks

Mark