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What do you get if you put an Englishman, an Irishman and a Welshman on a boat bound for Dublin?

Griff Rhys Jones, Dara O Briain and Rory McGrath return for the fourth series of Three Men in a Boat, and this time the trio are making their way across Ireland via canal and river, taking in the sights on their way to the famous Limerick Poetry Festival.

With Irishman Dara obviously nervous that Griff and Rory's behaviour (and in particular their terrible Irish jokes) will embarrass him up on home turf, his two companions are in their element. They see the trip as a perfect opportunity to irritate Dara while exploring Ireland's off-the-beaten-track midlands.

The trio start by sailing down the Shannon in the best weather Ireland has had in years, stopping off along the way to visit a friend of Dara's who also lives in Ireland's most haunted castle. After that they must face sailing through the terrifying Ardnacrusha, Europe's largest lock. Arriving in Limerick, Dara and Griff try a spot of powerboat racing, while Rory decides to host his own poetry festival for limericks only - the inaugural Limerick Limerick Competition.

The journey ends with a trip to the stunning Aran Islands, where the Men take a Galway hooker to visit the megalithic fort of Dun Aengus.