Newsnight's Stephen Smith has decamped to Donington Park services on the M1 to cover the general election campaign for Newsnight.

A motorway service station may not sound like a key election battleground, but according to psephologists, service stations - or rather, the people who regularly use them and live near them - hold the power to swing the outcome on 6 May.

This week he gets visits from impressionist Rory Bremner and shadow health secretary Andrew Lansley.

Broadcast on 13 April 2010