Snow!

This is very true - I had some absolute knobbers in vans and cars driving past me at 30 down Camden Street this morning when I was deliberately avoiding the cycle lane because it was full of ice, so I rode in the middle of the lane all the way after that. One bit of ice when you're that close and you could be under.

I wonder at what point HTFU becomes blind stupidity and dangerous advice. Today it might be possible to ride if you can get to a main road and stay on it and don't foresee any problem with vehicles giving you enough space (bear in mind that whilst you might be able to control your bike they might not be able to control their car/van).