BRITISH newspapers agreed today that Prime Minister Tony Blair's first-ever defeat in Parliament was a major watershed in his administration. Thanks to 49 rebel Labour MPs, the House of Commons voted down a proposal - championed by Blair in the wake of the deadly London bombings in July - to give police the power to hold terrorism suspects for 90 days without charge. Both The Times and The Daily Mail splashed Blair's setback on their front pages with the identical headline: "Beginning of the end?" "Mr Blair has looked invincible for the past eight years. But after yesterday, he no...