A late header from Wilfried Bony gave Swansea City their first ever win at Old Trafford, knocking Manchester United out of the FA Cup in the process.
Wayne Routledge put the visitors ahead in the 12th minute, before Javier Hernandez equalised just four minutes later.
Bony's winner in the 90th minute means Swansea will play either Birmingham, Bristol Rovers of Crawley in the fourth round.
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The peer will attack Prime Minister Theresa May for failing to represent the 48% who voted in favour of Remain.
Paul Flynn, MP for Newport West, will open the debate in Westminster Hall.
It will represent another boost to the region, after the announcement Deca Sealand was chosen for a repair hub for defence aircraft.