UK's Corbyn says Brexit has 'overriden normal political debate' as Labour set for crushing defeat The leader of Britain's main opposition Labour Party Jeremy Corbyn says Brexit has 'polarised, divided and overriden political debate' and led to the huge losses experienced by the Labour party, which is predicted to suffer a crushing defeat in the UK general election. But Labour MP Emily Thornberry says the party 'is not beaten' and will continue to 'fight' Prime Minister Boris Johnson. IMAGES AND SOUNDBITES