The mid-1970s saw Capital Radio expand with the launch of the Help a London Child charity, which aimed to raise money for London's poorest children. The charity appeal went on to become one of the longest-running in broadcasting and the most recognised in British radio. In 1976, Capital Radio, Thames Television, London Weekend Television and British Telecom launched the Capital Radio Helpline which helped listeners through matters ranging from how to cook a turkey at Christmas time to suicide intervention. The station has also lent its support to London-based orchestras, choral societies, the British Film Institute Children's Film Festival and many other ventures.