Barack Obama and Helen Mirren contribute to Queen Elizabeth II: Her Story, Our Century. Plus: David Attenborough’s delightful tour of British backyards continues. Here’s what to watch this evening Barack Obama and Helen Mirren contribute to Queen Elizabeth II: Her Story, Our Century. Plus: David Attenborough’s delightful tour of British backyards continues. Here’s what to watch this evening 9pm, BBC One The Queen would have been 100 this week and is, in death, still one of the British royal