Hornet Mimic Hoverfly (Volucella zonaria)
When you see this large hoverfly in among mostly smaller hovers, wasps and bees, it looks like the gentle giant, who'd you'd avoid upsetting, just in case.
A summer migrant, currently restricted to the southern half of the UK, it's a useful pollinator, as are very many hoverflies.
More information here:

''Volucella zonaria'', the hornet mimic hoverfly, is a species of hoverfly. These flies are capable of buzz pollination.
Similar species: True Flies
By Philip Booker
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Uploaded Oct 31, 2020. Captured Oct 14, 2020 12:24 in 27 Queensdown School Rd, Brighton BN1 7LA, UK.