The 650 as collated by http://www.firstpastthepost.net/
Of all the seats contested in the #UKGENERALELECTION2015 40% of seats are almost certain not to change handsThe table below shows candidates' win-probabilities in each of the 650 parliamentary constituencies.
— General Election (@UKELECTIONS2015) March 11, 2015
The probabilities are converted from bookmakers' odds. We control for longshot bias by removing any candidate with less than 20% probability.