I have tried to use Irish Ferries a number of times, generally on the Irish Sea routes. It is honest and fair to say that more times than not my booking has been cancelled or amended at last minute citing 'operational reasons'. Because ferry crossings usually involve onward travel this has been hugely disruptive to overall travel plans. I would avoid them at all costs because there is slim chance that the ferry crossing will actually happen when scheduled and the company obviously doesn't really care about delivering a service.
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