Small hoverfly - not a great photo set, but the pinched waist and white patches on legs show clearly. Possibly Platycheirus albimanus, but that's an uneducated best guess.
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No hoverfly has antennae this long! The wing venation is wrong, too, and, if you could see clearly, this has 4 wings, not two like a hoverfly. It is a hymenopteran.
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Crossed Wing x2 pairs , Patterned pronotal area , thick antennae all pointers that this is a sawfly P.albimans would have a leg tuft and different eye arrangement
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Sawflies are not waisted. It is a Hylaeus bee.
Well, at least you're all agreed that I haven't a clue :)
Lat/Lng: 53.7904, -1.7692
OS grid ref: SE153327
A deliberately unkempt spot at the edge of campus, partly occupied by a permaculture allotment, but in a predominantly urban area.