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... (the photograph is too unclear) but I'm reasonably sure that it's not Cirsium (or Carduus).
It looks a bit like a stonecrop, but too unclear to see if leaves are fleshy
... but none of he native stonecrops has that combination of elongated stems and red flower heads.
The leaves are hairy/downy don't recall a hairy Stonecrop.
i'll try to get a close up photo at some point!
... but the book I was looking at says July-September for the flowering period of Erica tetralix. On the other hand I can't offer a better match.
I also considered E. mackaiana but that flowers later, but it also hybridises with E. tetralix so goodness knows when that flowers.
... west Donegal and west Galway, so an occurrence in east of Lough Neagh would be a bit of a jump.
When one zooms out on the map the my error in considering E. mack.as a possible i.d. is rather glaring.
... it does look rather like Donegal if you don't zoom out. (Except that on the satellite view it's flat - a basaltic plateau IIRC - rather than mountainous.)
I'd never noticed that there was a satellite view - thanks for that!
Lat/Lng: 54.5276, -6.3075
OS grid ref: NW214232