It's fascinating how people evaluate risk. I'm heartened to hear reports of an increase in cycling following last week's bombs on public transport, that seems like a positive outcome, more so than, say driving a car. So whilst last night's Trafalgar Square Vigil was totally appropriate and quite moving, it bears reminding that in 2003 3508 people were killed on Britain's roads, that's 9 deaths per day. Where was their vigil?