further to my update:

I passed a runner on the road last night coming home from the station.  I was in the Landy, it was dark, he was on my side of the road, a dark unlit twisty road not unusual in this rural part of Essex.  I saw him from a long way away, and was able to pass him safely.  The reason?? he was glowing in hi-viz from head to toe.  no doubt there would be those who think dressing this way is very un trendy, but I would suggest a hospital gown is even worse!

PLEASE: wear as much as you can.  it undoubtedly saved this runner from a close call with me speeding by in the Landy rocking to Slipnot!!