About 10mm long [body] with black and greenish/white markings. Long dark legs.
No interactions present.
I looked this up on an internet site and from the photographs that I saw, it looked just like a Hemiptera - Oncotylus Viridflavus, so at the moment I am going to agree with Babu1.
What I thought off as being an instar, may wll be a wingless female.
Lat/Lng: 50.7212, -1.84759
OS grid ref: SZ108912