Rival EU camps vie to seize momentum for final stretch

Minister warns Brexit vote is 'irreversible' that 'going back' requires unacceptable terms

Rival camps battled on Monday into the final stretch before Britain's referendum on European Union membership, after the shock killing of a lawmaker halted the campaign.

Politicians returned to parliament, which had been in recess, for a special sitting to pay tribute to Jo Cox, a pro-EU campaigner murdered on a village street last week.