Small diptera with reddish tinge. Could this imply it is a blood supping species?
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Interesting species to be putting up and I wish I were able to help you more, Susan.
One thing that would help with an ID would be to remove the insect from the white tray and photograph it against a more neutral background. As it is, the contrast dark v white means that detail and colour is quite hard to make out.
My Flickr photos...
Lat/Lng: 54.0757, -2.7335
OS grid ref: SD521646