Mrs Harris is a salt-of-the-earth charlady, content with her lot, cleaning the homes of the rich. However, her knack of setting things straight often has the tendency to stray beyond keeping things neat and tidy... In Mrs Harris MP, the honest as-ever old char impresses her employer with her no-nonsense political views to such an extent that he - an MP, no less - encourages her to become a voice for the people of Battersea and stand for election herself. The world of local politics, however, soon proves a test for a lady as straight-laced as Mrs Harris; political skulduggery, the glare of the media and the apparent betrayal of a trusted friend all becoming issues she just hadn't bargained on...