Stephen Warnock also forced a save from Walker before the same player cleverly dummied a cross from Procter and Peter Atherton lashed a long-range shot inches wide of Walker's right-hand post.
Speaking for the first time in public, Mr Walker told the health select committee staff had been forced to cancel 700 operations when hospitals were full of emergency cases in 2009.
He also had John Maunders caught by Eoin Morgan and Mark Pettini lbw to leave the visitors in deep trouble before Walker and Foster steadied the ship until heavy rain forced an early close.