For each programme, a millionaire leaves his/her luxurious life behind, takes on a secret identity and lives undercover in a deprived area of the country for a week to ten days. Living on a limited budget with no modern conveniences they must forge their own way in the community – working and volunteering alongside the locals and finding individuals or projects whom they think deserve a cut of their fortune. On their final day, the millionaires come clean and reveal their true identity to the people they have chosen, surprising them with gifts of thousands of pounds or dollars to improve their lives.

Source: Wikipedia.org