As You and Yours celebrates its 40th Birthday - Julian Worricker takes a look how energy has shaped the past four decades. In 1970 an electricians' strike brought power cuts, a former National Coal Board adviser was warning that the UK was over-reliant on fossil fuel and Prince Charles caused controversy by warning about harming the environment. "Natural Gas" was being introduced to homes for the first time and bringing down domestic fuel bills and one of the biggest North Sea oilfields was first discovered.You and Yours investigates how attitudes to energy policy have changed during the lifetime of Radio 4's midday consumer programme.