An anthomyiid fly on ivy blossom. There was a big emergence of parasitic wasps here yesterday, and in amongst them was this fly - the flower buds are no more than 2mm across for scale.
No interactions present.
Lat/Lng: 51.072, -0.69
OS grid ref: SU918311
On ivy in my garden, in mixed broadleaved woodland, altitude 238m, oak, birch, chestnut and willow nearby.