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I'll e-mail the link to a friend in Germany who is an sawfly expert. He'll be very keen to see the photos. It may take a day or two to get back to you.
Cathal, the following is the response from Andrew, so this Det should be his.
Yes, the photos are interesting. I'm reasonably sure that the sawfly larva belongs to Tenthredo livida Linnaeus, 1758. The dark, net-like markings on the dorsum are distinctive in combination with the entirely pale head and other colour characters. T. livida is widespread and rather common (incl. Ireland), usually in wooded areas in lowlands. Its larvae are polyphagous.
Thanks for this and sorry for the late reply. This would remind you a bit of a stoat preying on a hare! I think they go for the throat also.
Maybe Andrew would consider this one also, it looks similar:
Lat/Lng: 54.8991, -6.3789
OS grid ref: NW193648