John Bercow was dragged into a furious row with a long-term nemesis on his last day as speaker of the House Commons as he was accused of “defending the indefensible” at the “fag end” of his tenure. The speaker was blasted by Andrew Bridgen as MPs debated a report to suspend Labour’s Keith Vaz, who was this week found to have “expressed willingness” to purchase cocaine for others by parliament’s standards committee.