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This little delight is less than 1mm long and was in two of my traps this week, phots are taken down the microscope and any hints on improving the focus will be tested.

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and another view

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I'd say Agromyzidae...

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I really need to learn how to recognise Agromyzids, what characters do you or does anybody use to distinguish them, they are a large group?

Gordon

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They are leaf miners.
The agromyzids have BM-Cu crossvein present; usually DM-Cu crossvein absent; the cell cup is closed. (please see Overviews to see these features). The ovopositor is very easy to recognize with their oviscape with a conical shape (visible on your photos - your fly is an agromyzid female). They have never ocellar triangular as chloropids have; the arista is bare but can also be pubescent.
The frontal bristles (those which are on parafacialia) are incurved, usually the lowest (this is visible in your first photo.) For example, chloropids (that has a big ocellar triangle) never has such f-bristles incurved.

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Thanks Jorge, I will do my best to digest that.

Gordon