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Definitely a barkfly. There is a good gallery of UK species photos here: http://www.brc.ac.uk/schemes/barkfly/gallery.aspx It looks quite similar to a common species Graphopsocus cruciatus I've photographed before, but the markings look faint here. Maybe it's a faded adult that has overwintered, but it could well be another species.
Nick Upton, naturalist and photographer.
Thanks for the comment. Yes, it does bear a certain but not complete resemblance to
Graphopsocus cruciatus which I observed within the site last year.(Addition to iSpot on 27th July 2011). An overwintering specimen hadn't occurred to me. I had rather been thinking the other way round till then i.e. since the site doesn't have a transparent plastic dome over it, there is a question as to which species are indigenous to it and which come from outside.
For sure, alibet teneral...this one of the most common of Psocoptera, can be quite ubiquitous too.
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Lat/Lng: 51.4337, -2.7624
OS grid ref: ST470707