The big launch of the Lib Dem battle bus is later this morning. But your correspondent has discovered the special weapon cunningly hidden on the South side of the river.
Not many surprises: it is big and yellow and includes the word ‘change’. The most interesting thing is probably the giant picture of Vince Cable. Some of the public will no doubt be left asking: who is the young man standing next to Vince?
UPDATE: Where are the windows? Is this some kind of cruel revenge on the British media?