But as we know, the picture is seldom uniform across the country; the national headline figures can sometimes mask what is happening in marginal seats where elections are won and lost. (lordashcroftpolls.com)
I have my doubts about the reliability of marginal seat polls since the average number of voters polled per constituency is only about 10. (conservativehome.blogs.com)
Both the main parties could count on winning hundreds of safe seats each and the electoral battle would be won or lost in a smaller number of key marginal seats. (theconversation.com)