This is a small (body length 4 or 5 mm without ovipositor) parasitic wasp. It is completely orange-brown.
Summer to early autumn.
Macrocentrus linearis is a parasitoid of Tortricidae moths (especially arboreal ones).
Thought to be widespread and fairly frequent in much of Britain, but seriously under recorded.
Status in Leicestershire and Rutland not known.
Leicestershire & Rutland Map
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Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015