A metallic blue beetle on poplar - I seem to have seen a lot of these this year, always on poplar. Some sort of leaf beetle perhaps?
No interactions present.
That certainly looks like a good fit. I keep seeing loads of these on my local walks recently and I'd like to identify one to species level - do you know if there is a key or a list of distinguishing features between the two species you mentioned?
There is indeed... this is the one you want:
and it will let you get to grips with a whole host of other beetles as well. :o)
Lat/Lng: 53.77443, -0.34665
OS grid ref: TA090321