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M_V
JoePablo
Apparently it's Heterarthrus fiora - a type of Sawfly (they are related to wasps) that as a larvae lives in mines within the leaves of Sycamore trees. Once the larvae are mature they seal themselves in a circular puparium within the leaf that eventually dries and falls to the ground. The adult Sawfly eventually emerging from the puparium.
It was ID'ed by a professional entomologist who in this case is clearly far better at identification than an AI image recognition tool - impressive given that there are over 24,000 insects in the UK to choose from!
See - https://www.naturespot.org.uk/species/heterarthrus-aceris
and
https://www.galerie-insecte.org/galerie/ref-121816.htm