22:00-04:00. Con. Lab or Lib Who's going to be your MP? Who's going to govern Britain? You'll know first with the BBC and Alastair Burnet. As the polls close, the result of three how-did-you-vote surveys in key constituencies will be the earliest guide to the story of the night: Is it Conservative or Labour for the next five years, or could Liberal hold the power? Nobody will be watching early developments more than the party leaders: The Prime Minister, Rt Hon Edward Heath in his constituency, Sidcup with DAVID DIMBLEBY Rt Hon Harold Wilson in Huyton with MICHAEL CHARLTON Rt Hon Jeremy Thorpe in Devon North With DAVID LOMAX The first declaration is expected from Newcastle Central, Guildford, Cheltenham or Salford. Whichever it is, the Election 74 camera unit recording the result will start the fullest, fastest results service, analysis, prediction and explanation of what it's going to mean to Britain and to you. Alastair Burnet leads the coverage from the Election 74 studio.