Earlier in the day, Queen Mary 2 was at the Ocean Terminal and Queen Elizabeth was at the Queen Elizabeth II terminal. However, both Cunard ships had departed before Oriana passed those terminals.
The tug departs after Oriana clears the harbour. Oriana then proceeds down Southampton Water towars the open sea (below).
Cruise ship photo feature - - P&O Cruises - - Oriana - - Oriana Sails