This is the consequence of declining turnout and less support for the two main parties.
Turnout varies wildly between constituencies. What could that mean in a close election?
Most produce results that are more or less what a reader of opinion polls and other electoral data might have anticipated a few months in advance.
Major’s success was the polling companies’ failure. This time, Cameron must deliver more.
7.3. 25-35. 1992. And – last but not least – 9.