LONG NARROW SHELLED SNAIL ON TREE TRUNK
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This is certainly one of the snails in family Clausiliidae, and as far as I can tell from the published atlas the only species in Ireland are Cochlodina laminata, Clausilia bidentata, Balea perversa and Balea heydeni. I don't think yours is Balea, the shape doesn't look right for that, but from the photo alone I'm not sure I can choose between Cochlodina and Clausilia.
Do you know exactly how long it was? Cochlodina should be 14-17mm when full grown, Clausilia 9-12mm. Cochlodina is usually shiner and smoother than Clausilia, and to me your photo doesn't look quite smooth enough for Cochlodina. Cochlodina also seems to be much rare than Clausilia in Ireland, and is a bit less prone to climbing trees (but it does do so sometimes, especially in wet weather).
But I don't know them well enough to be certain which it is from the photo.
Entomologist and biological recorder
Not sure about lenght, have started to carry ruler with me ,lots of them about will visit area again and get back to observation.Considering our rain at that time almost everything was climbing trees :)
Lat/Lng: 52.5, -7.8
OS grid ref: SF0815