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I am pleased to report that the syrphid larva I picked up in Tower Hamlets Cemetery Park, east London in October last year pupated in mid-February and hatched on 17 April - but not into a Platycheirus. I have identified it as a male Sphaerophoria scripta and attach photos. I'm afraid it hatched at a thoroughly inconvenient time and I had to pin it in a hurry, so I have not hinged out its genitalia because its wings seemed so clearly shorter than its abdomen. Now that it is pinned I am not so sure though. I have looked at the hairy genital lobes as best I can in their position tucked under the abdomen, and they do seem to be long, as for scripta, but I hope I haven't made a frustrating mistake.