Education and transport will be the focus of tonight's election broadcast by the Liberal Democrats.

While Labour have relied on celebrity endorsements in their programmes and the Conservatives have used two hard-hitting ads to get their message across, the Lib Dems have again based their traditional film around Charles Kennedy.

The Lib Dems party leader, standing in a school playground, will criticise class sizes and tell viewers that he will reduce the class numbers for five to 11-year-olds to 25.

The broadcast also features a woman commuter who complains about how crowded and unreliable the train she uses to travel to work is.

"To end the misery, Liberal Democrats will introduce much tougher regulation to make the railway companies improve their service," Kennedy will tell viewers.

Tuition fees for students also go under the spotlight with the party comparing two students at Edinburgh University - one who pays tuition fees and one who does not. The party promises to abolish tuition fees in England - extending the policy it helped to introduce in Scotland.

"We all want better public services, don't we, and only the Liberal Democrats have honest plans to fund them," Kennedy says.