Gagged but not bound

I'm not sure what you think of John Sutherland, this year's chairman of the Booker panel. All I know is that he's manna from heaven to book reporters. He's "an inaccurate and impenitent leaker of panel discussions", "incredibly indiscreet", and he's been voluntarily "gagged". The muzzle slipped, though; he is now ranting about Penguin. Specifically, about Penguin not sending his bally book to Waterstones.