The Society for the study of flies (Diptera)

Hello,

I am going to send this to Paul Beuk for ID, but as I had already prepared the photos for posting here I thought it would be interesting to see if anyone could make a suggestion before it gets named.

I found it dead on my kitchen sink on 7th January.  I'm a little south of Lincoln, heathlands, old woods, pastures, some crops and a few animals surrounding including horses.  Size ~5mm.

Janet