Party political broadcast

A party political broadcast (also known, in pre-election campaigning periods, as a party election broadcast) is a television or radio broadcast made by a political party. In the United Kingdom the Communications Act 2003 prohibits (and previously the Broadcasting Act 1990 and earlier broadcasting practice prohibited) political advertising on television or radio; parties are instead allocated broadcast slots (usually around five minutes long) free of charge on broadcast channels using a formula set by Parliament.

Source: Wikipedia — Party political broadcast (CC BY-SA 4.0)