Confidence: I'm as sure as I can be.
Notes: Much less cryptically marked than the larger A. varia. Agrypnia obsoleta is a species of upland pools and bogs. This one was observed at a slightly acidic upland lake surrounded by blanket bog and is a perfect match for the one photographed on page 95 of 'The Adult Trichoptera of Britain and Ireland' by Barnard and Ross 2012. Only two other Agrypnia species have been recorded in Britain, one of those in Ireland but they both resemble Limnephilidae caddis and are not easily confused with obsoleta or varia.