<span style="color: #222222;">UK's House of Commons Speaker John Bercow disallowed a third vote on Prime Minister Theresa May's withdrawal agreement with the EU. </span><br />'' <br />'' <span style="color: #222222;">Bercow ruled that he would not allow another vote on the government motion if it remained substantially the same after it was defeated by a huge 230-vote margin in January and a smaller 149-vote margin last week.</span><br />'' <br />'' <span style="color: #222222;">He said parliamentary conventions dating back to 1604 meant MPs could not be asked to vote on precisely the same subject twice. </span><br />'' <br />'' <br />''<span style="color: #222222;">The Speaker said the second meaningful vote motion on May's Brexit deal held last week did not fall foul of parliamentary convention. </span><br />