But former Lib Dem leader Sir Menzies Campbell described the coalition as a "marriage of inconvenience" and said there would be "a lot of hard talking" on the issue of Commons boundary reforms - thought likely to benefit the Conservatives - should plans to overhaul the Lords collapse.

BBC: UK Politics

Mayor Ferguson said the issue was how to define the city centre in order to decide where to draw the charging boundary but he hinted it was unlikely to be the size of the residents' parking zone.

BBC: Road