Op chillax.
Having advised chillaxing to the OP, I was irated last night when I saw a cyclist with their front light on flashing which is one of my hates. The thing was that the cyclist wasn't getting closer to me as quickly as it should have been. Then I realised why. A chav on a BSO who was dressed in black head to toe had placed his white flashing front light rear wards ie on the seat pin facing back!!!! No front light. What a numptee which I told him as I passed by. He then turned off abruptly into the chav Arbury estate.
I have done that deliberately!
Some little runt had tried to nick my back light off the rack, and merely managed to break it.
So took the backup flashing LED off the front and placed it on the back.
Got me home safely with lights front and back...far safer than riding with no rear light