Reddish antennae and dark wing membranes. On ivy.
No interactions present.
The dark blobs on the bases of the wingcases look odd. As does the pale edging to the thorax. This species turns purplish brown in winter, and reverts to emerald in spring. So your specimen is 'all wrong' from the start. Not sure what else it can be though. It would be even wronger for Nezara viridula.
No, undisturbed ivy in the local churchyard. The plant was enjoying a bit of January sunshine and was relatively warm.
Could this just possibly be a hybrid between Palomena prasina and Nezara viridula – the Southern Green Shieldbug? British Bugs Gallery list the latter as a recent arrival in the UK; depending on state of maturity, it can have dark marks at locations encompassing those here.
Or this might just be a P. prasina whose nymph didn’t fully lose its black markings.
Its a brave soul, and an early(ish) siting given latitude - these are dependant on extracting plant juices from leaves for dinner. I am struggling to see any of the distinctive 'dots" at the top of the shield ,. It looks like some sort of bilateral injury possbly a sun scorch from rain drops it could less likely be as said, a development hang up. I doubt its a Hybrid -check out the NBN distribution of the Southern GSB and its very locally restricted South , Interesting Mystery
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Lat/Lng: 52.1, -1.6
OS grid ref: SP3155