Outside, pro- and anti-EU protesters with flags and placards took up well-worn positions on nearby pavements and squares, their rivalry and modest numbers reflecting how Brexit has both divided and exhausted the nation.
Some politicians complained that the atmosphere outside parliament had become ugly and intimidating. But on Thursday at least, protesters were subdued and few.
Today could be different. This is really the last day and the last hour for the PMs Withdrawal Deal.
It could be Britain’s finest hour or one of its Worst.