Jeremy Vine standing on coloured-in graphic of map of Britain
Media playback is unsupported on your device
Video

Election 2015: How can SNP and UKIP get seats?

How would the current Westminster electoral system transform SNP votes into seats? And how could UKIP expect to do in contrast at this election?

Jeremy Vine takes a look.

Go to next video: Scotland 'has put firecracker in election'