Martin Underwood wrote:
As I said earlier, I wonder if
left-handers generally are more polarised to left-handedness and
less ambidextrous than right-handers for non-precision tasks?

This seems to me to be rather unlikely, as left-handers have to adapt
continually to the right-handedness of everyday objects, and should
therefore become more ambidextrous than the average right-hander.
Possibly resentment about this can lead to some left-handers
deliberately (or subconsciously)limiting their apparent ambidexterity?
--
Richard J.
(to e-mail me, swap uk and yon in address)