Sawfly (Tenthredopsis sp)

Sawfly (Tenthredopsis sp)

Observation - Sawfly (Tenthredopsis sp) - UK and Ireland. Description: Was resting on an oak leaf. Thinking wasp rather that sawfly as waist quite thin although not very visible. Had very long hind legs. Has unusual colouring to me at least! Anyone know the species please? Thank you!

Was resting on an oak leaf. Thinking wasp rather that sawfly as waist quite thin although not very visible. Had very long hind legs. Has unusual colouring to me at least! Anyone know the species please? Thank you!