Judged by the low expectations that dogged Mr Johnson then, he has been a pleasant surprise, says Dermot Finch, the director of the Centre for Cities, a think-tank.

• 智囊公司“城市心脏”执行官德尔莫.；芬奇评价：鉴于竞选时约翰逊并不为众人看好，因此现在他的业绩算得上惊喜。