that 5.9% is absolutely a load of rubbish. Come to Cardiff its almost 100%
The figure comes from a (frankly questionable) survey done by Auto Express a few years ago. It was done at Highbury Corner, they counted 974 cyclists 58 of whom jumped the light. That was 5.955% when I went to school.
I don’t doubt the figure may be higher or lower at a given different junction, it’s hardly a rigorous survey (though still more rigorous than your anecdote where you’ve already cherry-picked “some cyclists” from the total) and there’s no reason to believe that that one junction is representative of the country as a whole. I do sincerely doubt however that it’s “almost 100%” wherever you are.