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Hi Nigella.

Sorry, but the picts are too small to give a definite opinion.
But first impression is that most, if not all, are actually Sarcophagidae or Calliphoridae.

A very very crude, but nevertheless quite effective rule of thumb goes like this:

Arista bare -> Tachinidae (or Sarcophagidae Miltogramminae)
Arista plumuse -> Sarcophagidae / Sarcophaginae, Calliphoridae or Muscidae

If all the animals in your pictures have plumose arista, most will not be Tachinids


Theo