Gyles sets out to discover the process by which a few personalities - but only a few - get to become one of our celebrity jewels. He finds out whether 'national treasure' status comes down to longevity, eccentricity or several ungainly appearances on Strictly Come Dancing.
He hears from national treasures including Sir Terry Wogan and Dame Edna Everage - who naturally considers herself to be an international treasure - and finds out what our national treasures reveal about British identity and our changing attitudes to heroism, and to our history.
And, using his rigorously devised National Treasure Matrix, Gyles assesses his own chances with an exacting focus group comprising journalist Danny Finkelstein plus writers and broadcasters Natalie Haynes and Bidisha.
Will Gyles's weakness for teddy bears and gaudy jumpers be enough?
Producer: Paula McGinley.