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Hello,
On 24 July I photographed a nice silvery fly sitting on the wall of our block of flats just opposite the bin shed. It is shown in the first three pictures. On 5 August there were a lot more of them in the same place, so they came probably out of the dustbins. Some had a coppery shine, and some were rather green. I learned from the forum that Lucilia starts green and becomes coppery, but is it silvery at the beginning of its adult life?
Information is gratefully anticipated by
Sundew

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Here are the pictures from 5 August.

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The silvery fly looks teneral to me - it has just emerged from its puparia, as can be seen by the swollen face. Thus the body and wing colouration hasn't been fixed and so it could very well be a Lucilia 'in disguise'

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That is extremely interesting. I would never have expected such a drastic change in colour. Neither I saw a comparable picture. Should we add one silvery state to the gallery, or is this confusing?
Many thanks, Chris!
Sundew

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Too confusing i think - just watch for that swollen face - it is very distinctive in teneral flies.