The series focuses on her accession, her daily routine, how she is seen as a role model, and how she coped in her 60th year as monarch.

It achieved an Audience Appreciation Index of 90 out of 100 for each episode; a higher than average rating.

The documentary was criticised by the campaign group Republic.

Graham Smith, the organisation's chief executive, argued in a letter to the chairman of the BBC Trust, the Lord Patten of Barnes, that the programme breached BBC guidelines on impartiality.

Smith wrote in his letter that the series was subject to "distortions, half-truths and fabrications" and commented, "What was presented as a piece of biographical journalism was in fact pro-monarchy polemic".