Next week sees the return to our screens of the BBC's hit show Who Do You Think You Are? Now in its eighth series, the concept is simple but absorbing; it follows a celebrity on a journey to trace their family tree. Inevitably it throws up ancestral tales which are comic, disturbing, heart wrenching and downright tragic - it makes for compelling television. Such is its success the format has been syndicated to over a dozen international broadcasters.WDYTYA not only shines a light on an individual's family fortunes it also showcases the repositories of celebrities' secrets, the UK's network of libraries and archives. And the crown jewel in that network is the National Archives, in my book one of our greatest and yet unsung institutions.More... (http://www.huffingtonpost.co.uk/andrew-wigley/who-do-you-think-you-are-_2_b_916820.html)