oaw[I] - hoverfly [Explored]

A late season hoverfly tucking into a late flower, down by the river.

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Research indicates that this is Helophilus pendulas, also know as a "sun fly" from their habit of basking in sunlight, explains how I got close enough for this photograph !
en.wikipedia.org/wiki/Helophilus_pendulus

Went back to check on the flowering plant, to see if I could make an identification. I think it is an Erysimum species, by the flower, the leaves are somewhat hairy ... there has been quite a patch of them in that area. Probably a garden escape, originally. The patch has had a long flowering season, producing largely white, or very pale pink flowers, with some strongly scented.