P&O Ferries is the current name for the amalgamation of a range of ferry services that operated from the United Kingdom to Irelandand Continental Europe (France, Belgium, the Netherlands and Spain). These were previously operated at different times as separate subsidiaries of P&O under the names Pandoro Ltd, P&O European Ferries, P&O Portsmouth, P&O North Sea Ferries, P&O Irish Sea and the joint venture P&O Stena Line.

Info gleaned from Wikipedia