Should CEOs have term limits?

In some countries politicians have fixed term limits. What would happen if the same principle applied to CEOs? On average bosses in the UK stay for just under six years. But founder chief executives stay much longer. Evan Davis and guests discuss whether chief executives know when their time is up? Guests: Martin Gilbert, co-ceo, Aberdeen Standard Investments. Margaret Heffernan, author and entrepreneur Catherine Bright, a leadership consultant with Spencer Stuart.