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I think you are on track with your title of 'nit'. It is a louse, but unless you say what animal it came off the ID is not likely to be any more specific. However, 'nit' is the egg, not the adult.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
It came off a Human ...
I thought it probably did! It is quite instructive to look at the NBN gateway map - it is apparently one of UK's rarest species.
Not rare in my house !
well they are now... :-)
Lat/Lng: 53.193337870441, -0.11047750711441
OS grid ref: TF263679