Britain heads for historic Brexit ballot Britain’s House of Commons is to vote on the Withdrawal Agreement – the terms on which the UK will leave the EU – with Prime Minister Theresa May needing support from Labour rebels to win approval How parties may vote in 650-seat lower chamber Speaker Has casting vote (last used in 1980) Conservatives: 315 50-plus MPs could vote against Labour: 257 Up to 20 rebels could support deal 50 100 150 200 250 300 Democratic Unionist Party*: 10 Suggested it will vote against Scottish National Party: 35 Liberal Democrats: 12 Independent: 8 Plaid Cymru: 4 Green Party: 1 Will all vote against Sinn Féin: 7 Abstentionist policy – will not vote *Conservatives and DUP have “confidence and supply” agreement which includes supporting government legislation pertaining to UK’s exit from EU Sources: UK Parliament, Stratfor © GRAPHIC NEWS