I found what looks like the Dolichopodid L. virens but seems odd from an Edinburgh garden, although the cross vein m-cu seems to be in the right place
and the fly was about 5-6mm. Photos from 28th April. If anyone can clarify for me that would be great, thanks, David
Looks fine for Liancalus. It has a habit of turning up in some surprising situations, particularly in urban areas - my conclusion is that it can cope with relatively small bits of larval habitat, and may be opportunistic in that respect. Martin Drake will have a more comprehensive take on how it exploits habitat across the country.