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A thought, is the summer winter gnat a nocturnal species which is why it is rarely caught by sweep netting?

Also, is the gnat closely associated with ash trees? If so, will it benefit in the short term from ash dieback disease but in the longer term be in trouble?

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Rot holes I've found have produced a number of other interesting craneflies (I know C. hirtipenne is not really a cranefly), including this Rhipidia ctenophora from a horse chestnut, as well as R. uniseriata on several occasions from ash.

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Rhipidia ctenophora, Whiddon Deer Park, 2018, reduced

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Once I have collected rot hole material (always being careful to leave plenty behind), I place it in a white bucket, cover the bucket with netting, keep it moist, and wait to see what emerges. Simple!

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Dead wood buckets, Locks Park, 1 March 2019, reduced

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The wing venation is characteristic, with vein A2 being short and curved, but a bit longer and less bent than for members of the genus Trichocera.  The wing veins are hairy, and the wings are horribly fragile!

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Diazosma hirtipenne, Dunsland PaRK, May 2019, reduced

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Here's another veteran ash tree that provided larval habitat for the "winter" gnat.

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Veteran rotting ash tree, Scadsbury, September 2015, reduced

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Material collected from his rot hole at the base of an ash tree in a small patch of ancient semi-nature oak-ash/bluebell wood produced 10 summer winter gnats betwen late May and early June this year.

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Ash tree with hollows, Scadsbury Copse, April 2021, reduced

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Cladoneura hirtipennis, the summer winter gnat (now there's an oxymoron), is a seldom seem member of the British Trichoceridae fauna.  I have yet to find one by sweeping but they have emerged from woody rotting debris I have collected from several ash rot holes.

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Cladoneura hirtipenne, ex ash rot hole, Scadbsury Copse, Locks, 6 June 2021, Rob Wolton, reduced