The epic six-parter continues, telling the gripping family saga of the world's most famous dynasty over the last 100 years. The third episode reveals how Prince Philip was frustrated by having to give up his beloved naval career in exchange for a lifetime of trailing after his wife - but channelled his energy into becoming the Windsors' most radical moderniser. When Elizabeth is catapulted on to the throne, her husband wants to assert his rights by having his children bear his surname of Mountbatten. But the young and inexperienced Queen faces formidable opposition from her mother, grandmother and the most powerful man in the land, the PM Sir Winston Churchill. They want the Royal Family to retain the very English name 'Windsor', and the Queen gives in.After Elizabeth becomes queen, Prince Philip shakes things up with his modern ideas, including using television to revamp the Windsors' public image.