Greenbottle Fly

Greenbottle Fly

Observation - Greenbottle Fly - UK and Ireland. Description: On woodland/meadow margin. I think this resembles Lucilia more than other greenbottle flies but this is an extremely hesitant id. I have no reliable starting point, can anyone can recommend a good beginners' guide or key for common flies?

On woodland/meadow margin. I think this resembles Lucilia more than other greenbottle flies but this is an extremely hesitant id. I have no reliable starting point, can anyone can recommend a good beginners' guide or key for common flies?