Elongated worm like creature with two minute invertebrates with two legs/antennae? Need to zoom in to see the two of them.
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That looks a very sizable leech. Are Medicinal leech or horse leech possible in Ireland.
The boatmen are Notonecta and have 6 legs but 2 are very large and fringed - hence the colloquial name
Another possibility would be brook lamprey.
Medicinal leech when googled does not occur in Ireland
Lat/Lng: 52.0, -9.5
OS grid ref: SJ8667