routes across the Irish Sea: Cairnryan – Larne - conventional ferries (all year round with fast craft service during conventional ferries refit period; in 2013 this was 10 May to 10 June). P&O Ferries currently operates this route. Troon – Larne - fast craft service (Spring to Autumn). This route no longer exists. Liverpool – Dublin - conventional ferries (all year round). P&O Ferries currently operates this route. Fleetwood – Larne (route and ships sold to Stena Line in 2004). This route no longer exists. Mostyn – Dublin (2001–2004). This route no longer exists. Ardrossan – Larne (service changed to Troon - Larne in 2001). This route no longer exists. Rosslare – Cherbourg (route and ship taken over by Celtic Link Ferries in 2005; now operated by Stena Line) Dublin – Cherbourg (2001–2004). This route no longer exists though a new route linking the two ports has since been established by Irish Ferries. Fleet P&O Irish Sea operated a large fleet of vessels during its twelve years in operation. See also P&O Ferries P&O Stena Line P&O Portsmouth References External links P&O Irish Sea Corporate Site 'The Pride of Aisla and the Pride of Rathlin' - Scaled models built for Motis Ireland Ltd. Larne Ferry Web - for news & history of ferry services to Larne P&O (company) Ferry companies of Scotland Ferry companies of England Ferry companies of Northern Ireland Ferry companies of the Republic of Ireland