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Jeremy Corbyn has in contrast Theresa May's dealing with of Brexit with the "shambles" within the UK railways as they clashed at Prime Minister's Questions.
The Labour chief mentioned key paperwork, together with the blueprint for future EU relations, had been "delayed" whereas customs proposals had been "cancelled".
But Mrs May mentioned she was delivering on the 2016 referendum end result and urged Mr Corbyn to rule out one other Brexit vote.
It comes amid stories of tensions over post-Brexit "backstop" plans.