Look at the map... where's the red?
... and then look at the number of actual votes.
When Labour only get 783,585 more votes than Conservative, only 35.2% of the total votes cast, and only 21.6% of the total voting population of the UK... how the hell is that a win?!?
The whole constituency concept sucks really, because it's not an accurate representation of the UK. The figures above speak for themselves.