Twitched its white antennae tips a lot.
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Thanks John. What is it that indicates it is a Tenthredo?
What would be necessary to be confident it is T. livida?
T.livida is very common and the specimen depicted has field marks consistent with Benson's description in his RES Handbook.
As far as not being an ichneumon is concerned, it will not have a 'wasp waist'. In my experience, it just takes a bit of field practice to discriminate between sawflies and other hymenoptera.
Lat/Lng: 51.8091, -1.1746
OS grid ref: SP570125