branwen jeffrey, bbc news, southampton.dson, the bbc‘s political reporter for hampshire & isle of wight. let's look at the background here. all of the party leaders will look particularly at this seat and say, we can get this, it's 31 votes at the moment. it's very close, it's only been conservative since 2015, they won it from john denham who had labour. the city council is run by the labour party, the neighbouring seat is a labour seat. the voters here are volatile, they will pick and choose depending on the issue of the day, it is not a conservative heartland like the hampshire villages north of here all the cities that you might expect in the north that are very labour. it is certainly winnable for them. southampton has changed dramatically in the 18 years i have worked, its a very vibrant city, more and more students, growing student population, they can make a difference to the vote. there has been a lot of development as well but we have seen things like the loss of the shipyard, the loss of the ford transit factory.