Pollsters puzzle over Labour surge – and volatile electorate could keep them guessing

The election was supposed to be a coronation of Theresa May. Will it still be? After the pundits were criticised for getting it wrong in 2015, many are bewildered by figures showing Labour has closed the gap to within five pointsIt wasn’t the most lavish of birthdays for Jeremy Corbyn on Friday. Preparing for a morning speech on security was followed by preparations for a 30-minute grilling by the BBC’s most feared interviewer, Andrew Neil. It was only in the evening that he had some