High viz or cool?

that's the thing mate, you're a driver as well as a cyclist, you do look out for other cyclists, and therefore were able to see the difference which is not what I'm arguing about.

what I am saying is that if a drivers is not looking out for cyclists on the road, the hi-vis top make little/no difference.

Nobody 'looks out' for cyclists, so it makes sense to make yourself as visible as possible! Hi-Viz definitely does make a difference, especially in places where it counts most (cars pulling out of side roads in to your lane, with only a glance to their right), or cars turning in to side roads, only glancing in their mirrors.