HRH Queen Elizabeth names Britannia March 11, 2015 P&O Cruises Britannia. HM THE QUEEN NAMES BRITANNIA IN SOUTHAMPTON HM The Queen and HRH Duke of Edinburgh attend the naming ceremony of Britannia – P&O’s latest ship. HM THE QUEEN NAMES BRITANNIA IN SOUTHAMPTON HM The Queen and HRH Duke of Edinburgh attend the naming ceremony of Britannia – P&O’s latest ship. HM THE QUEEN NAMES BRITANNIA IN SOUTHAMPTON HM The Queen and HRH Duke of Edinburgh attend the naming ceremony of Britannia – P&O’s latest ship. P&O Cruises Britannia.