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Although this is likely to be T. niger, there is insufficient detail to be sure. You need to check that the hyaline apex to the tail is directed slightly upwards, the setae fringing the metazonites are fairly short and the transverse striae on the prozonites continue all around the body rings.
Thanks for your help. I have so much to learn - including a lot of the specialist terminology!
Lat/Lng: 56.332, -2.7486
OS grid ref: NO538157