David Dimbleby hosts this week's topical-affairs debate from Sunderland, where chief whip Hilary Armstrong , shadow chief secretary to the Treasury John Bercow , broadcaster Muriel Grey and bio-ethicist Tom Shakespeare make up the panel. Executive producer George Carey : Editor Nick Pisani CONTACT DETAILS: phone [number removed] (calls charged at 25p), or e-mail via the programme's website: www.bbc.co.uk/questiontime