For over 75 years BBC Radio has broadcast a Christmas appeal. The money raised is used by St Martin in the Fields to help the homeless in London and those in need across the country. John Waite finds out how the money is spent. He meets those who benefit from the work of the Social Care Unit in Trafalgar Square and hears from some of the many thousands of people who are helped by grants made possible by the appeal.

(Repeated at 5.40pm and on Thursday 3.45pm)