Decent ish article
https://yougov.co.uk/news/2015/04/29/why-its-so-hard-cameron-win/
The conclusion is clear. Unless the numbers of Lib Dems, SNP or Ukip MPs are very differently from those indicated above, the Tories need close to 290 MPs to stay in power, while Labour just needs to get past the 270 mark. That is why the winning posts for the two parties in two weeks time are different, and why Miliband could enter Downing Street even if he leads a slightly smaller contingent of MPs than Cameron.
https://yougov.co.uk/news/2015/04/29/why-its-so-hard-cameron-win/
The conclusion is clear. Unless the numbers of Lib Dems, SNP or Ukip MPs are very differently from those indicated above, the Tories need close to 290 MPs to stay in power, while Labour just needs to get past the 270 mark. That is why the winning posts for the two parties in two weeks time are different, and why Miliband could enter Downing Street even if he leads a slightly smaller contingent of MPs than Cameron.