P&O Cruises is a British/American cruise line operated by Carnival UK and is the oldest cruise line in the world. Southampton port has been the home of P&O’s UK cruise fleet since 1840. P&O’s flagship vessel, and its largest, is Britannia, accommodating 3,647 passengers and providing an enormous range of facilities and activities on board. Whilst the smallest cruise ship in P&O’s fleet is the Adonia, accommodating only 777 passengers and thus providing a more intimate cruising experience. The following P&O cruise ships are regular visitors to Southampton docks throughout the year.