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As far as I know the host is still unknown but it might be worth getting in touch with Peter Tschorsnig for the most up to date, Palaearctic viewpoint. This fly has a very strange distribution in the UK and had probably been around for quite some time, before it was found in 5 diverse locations in 2001 (see the 2002 paper here). They appear to like damp habitats but not particularly so and it's likely that the use of different sampling methods (Malaise traps etc) are the main factor in discovering this fly :)