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I keyed this specimen from Britain to Dynatosoma with Soli et al 2000, but I have no key to species. Is it possible to tell which one please?

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File was too big - here is a smaller one hopefully!

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Here is closer shot of genitalia.

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fuscicorne, male

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Thanks Jan. What features distinguish it from the other 4 British species please?

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As in other mycetophilids, most important characters are on the male genitalia. Some other characters may sometimes help too, such as colour of thorax and legs, but specialists usually rely only on genitalic characters.
In fuscicorne, a single narrow apical projection of gonostylus is specific, see e.g. photo here:
http://www.spessart-fliegen.de/diptera/mycetophilidae/dynatosoma/dynatosoma_fuscicorne/hpgs.html