found this small attractive fly at Hardwick Park
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As I understand it, a yellow-bodied fungus gnat should be S. hemerobioides.
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There is a europaen species of fungus gnat S analis which I am not sure if any of its recorded presence in the UK but it is v similar
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There are seven species of Sciara on the UK list, but analis is not one of them.
Probably best left at genus ?
Looking in Freeman's key, hemerobioides (thomae, as was) is the only one with yellow abdominal pleurae mentioned.
Lat/Lng: 53.1865, -1.3251
OS grid ref: SK451657