Brrr! it's on days like this that I'm glad my office is at home. No worries about transport being delayed or traffic accidents. The only worry I have is to keep my office at a comfortable working temperature as the temperature outside plummets. 16C is the legal minimum working temperature although 19C might be a more comfortable working temperature if you're not moving around too much.
For those small business owners who need to travel to get to their business this weather can be a serious issue. Time for a spot of business continuity planning? Too late for now but it will help you for the next time you can't get into work.