If you haven't seen my lights, what I'm wearing is unlikely to make much difference.
There are two confounding factors there: firstly, seeing a cyclist earlier does not necessarily mean that a motorist behaves any better towards them (in fact, there is a theory that seeing them earlier means the motorist is more likely to have dismissed them by the time they pass them, so are more likely to pass too close); secondly, unlit cycling is even a
factor in only a tiny fraction of cycle collisions. (2% when
http://road.cc/content/news/12065-report-dft-casualty-stats-says-cyclists-not-blame-93-cent-cases reported it.) Motorists with poor eyesight, playing with mobile phones or not concentrating should be removed from the roads before they hit
anything, not only unlit cyclists!
You can't "be seen". None of us are invisible, not matter how much propaganda tries to suggest otherwise. All road users must be reminded to drive within what they can see to be clear.
http://highwaycode.info/rule/126