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Given the very large numbers of continental Jays pouring into the country in recent weeks, following the failure of the acorn crop on the continent, I don't think you can be at all sure of the subspecies being hibernicus...it could just as easily be glandarius.
My Flickr photos...
However this location supports a large resident population of Jays and I haven't noticed any increase in numbers (I do realise that that is a very subjective statement)or skirmishes which are unrelenting but not any more than the usual.Also are you sure they are already pouring into Ireland? They will be sorely disappointed on the acorn front here also.
But as I say I cannot disagree,it is a possibility, but maybe...not just as easily.
You are right, of course, that hibernicus is more likely, but... .
The mobility of birds is such that I never think it is worth going to subspecies when the differences between those subspecies cannot really be seen with the naked eye, at least with any confidence. Almost certainly some will have reached Ireland, but you wouldn't see the difference, so won't know for sure.
Either way, there are far more Jays around than usual, so leaving it vague seems sensible.
Point taken and agreed.
Lat/Lng: 54.4, -6.1
OS grid ref: NW3515