If Labour's Marvin Rees is elected Mayor of Bristol on Thursday I for one will be celebrating. It will be a good day for Bristol. Many more people outside that city will rightly be inspired by Marvin's election. Bristol is a major city, a lively, exciting place with a strong local character and an appeal to the best and the brightest. It is a city with enormous potential, hampered by the absence of a big-city vision at a municipal level.