Seven people have been killed in central London after three men drove a van into pedestrians on London Bridge and launched a knife attack on people enjoying a Saturday night out in pubs and restaurants around Borough Market. This marks the second attack, in as many weeks, to hit the U.K., this time coming a mere five days before a contentious general election. This morning, Professor A.C. Grayling from the New College of Humanities in London spoke to us about the impact - if any - that both these attacks could have on polling.