Ichneumon Wasp (Stenichneumon culpator)
Most of the informed sources I've read give this wasp's season as being April to September. While there's always a little leeway, I'm still seeing S. culpator in my garden every day in multiple numbers, and it's now 8th November.
There's not an awful lot of further information at hand, but what there is can be read alongside this video:
Similar species: Wasps, Bees, Sawflies And Ants
By Philip Booker
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Uploaded Nov 8, 2021. Captured Oct 9, 2021 12:59 in 65 Crespin Way, Brighton BN1 7FL, UK.