I'm growing a Rondo and two Regent against a stone wall which holds a tremendous amount of heat after a sunny day. I'm hoping to get enough grapes to make a gallon or two for ourselves.
Have you spoken to the people at Derrynane Vineyard, possibly the most westerly European vineyard, and just down the road from you. Stephen Skelton's 'The Wines of Britain & Ireland' list a few vineyards in Co Cork too.
Cheers, Mark