BBC election guru John Curtice:

‘The truth is that they [Labour] should be on tenterhooks as to whether they will win the seat. That swing that they would need, it is less than the Labour Party achieved in Norwich, less than the Conservatives achieved in Norwich in the last Parliament, less than Labour achieved in Dudley West, Wirrel South just before they won the 1997 election. When oppositions look as though they are on course for government, the kind of swing that is required for Labour to win has been relatively common. To that extent, we have to ask ourselves, why is it we are not asking the question, could Labour win this? It is all of a piece, as a result of the recent elections, Labour do not have the enthusiasm and depth of support in the electorate that make them look like an alternative government.’