Martin Broughton, chairman of global cigarettes purveyor BAT, signs off on Wednesday after three decades at the business. He will then take up the equivalent post at British Airways. Broughton can be expected, as usual, to have a go at politically correct corporate governance practices, while politically motivated small shareholders are likely to question the company's exposure to markets such as Myanmar, the repressed former Burma, as well as query Tory grandee Ken Clarke's contribution as the group's £126,000-a-year deputy chairman.