MPs voted to adjourn the Commons early yesterday in a symbolic protest against the Government's controversial extradition arrangements with the US.
The surprise 246 to four vote, majority 242, came at the end of an impassioned three-hour emergency debate on the issue.
Liberal Democrats, who demanded the emergency debate, had joined with the Tories in condemning the extradition treaty as "one-sided".
Tories had been due to stage a three hour debate on home information packs, followed by a brief backbench adjournment debate.
But the highly unusual vote to adjourn the House ended the day's business abruptly at the close of the emergency debate instead.
Peers defeated the Government on Tuesday and voted to suspend the UK's extradition arrangements with the US until the American Senate has signed its side of the deal.
Earlier, at Prime Minister's question time, Mr Blair insisted there was no imbalance in extradition arrangements between the UK and the US.
Mr Blair also rejected demands by Liberal Democrat leader Sir Menzies Campbell to renegotiate the Extradition Act 2003.
He said the so-called Nat-West Three would still have been extradited under the previous rules.
Mr Blair said he had been informed that US prosecutors would not oppose conditional bail in the NatWest case.
Opening the emergency debate just minutes later, Liberal Democrat spokesman Nick Clegg insisted the treaty was "unfair and imbalanced" and urged the Government to ditch it.
"We're all aware that tomorrow morning, three British citizens are to be extradited to the United States on the basis of an unfair, imbalanced treaty that this Government negotiated in secret and to which it devoted the most cursory parliamentary scrutiny imaginable," he told MPs.
"Whilst it's too late to alter the fate of the so-called Nat-West Three except in terms of pressing for bail, in which we support any efforts the Government is able to make, it is not too late to abandon that treaty which is not yet in force in international law but which we have chosen, inexplicably, to implement unilaterally."
Solicitor General Mike O'Brien defended the extradition arrangements.
"Exact reciprocity between different legal systems is probably impossible," he told the Commons. "The US and UK legal systems diverted 200 years ago."