Not sure what this fly is but I saw it in Dorset today. There were lots of shiny blue and shiny green flies as well. All quite small.
A green one!
The first one appears to be a hover fly (family Syrphidae). Compare with Rhingia rostrata - https://en.wikipedia.org/wiki/Rhingia_rostrata
The greenish one likely is a blow fly (family Calliphoridae), but I would like to see a full dorsal view.