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Some confusion here. It can't be any sort of beetle as it lacks elytra (hard wing-cases). A. armatorius is an Ichneumon, not a sawfly. Some sawflies do look very like ichneumons, but always lack the 'wasp-waist' that all ichneumons show well, as in this picture. Neither group (especially the ichneumons) is easy to do to species from pictures (or even specimens), and certainly should not be identified, except in a handful of cases, without a full technical key.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Syrphus, I see more Ichnuemons being spotted and would be interested to know if they are growing in number and the spread of these.
I don't imagine anyone knows much about population trends in more than possibly a tiny number of economically important species, but I would be surprised if there really are any more around than previously.
The family is enormous, and any Hogweed plate in summer is likely to have several species on or around it, so they are obvious and easily photographed for iSpot. Very few people can identify more than a tiny fraction of the 1000+ UK species, let alone monitor populations.
Lol, this is one of those identifications i did when i first joined knowing even less than i do now, ive now learnt enough to say i have no clue to what it is lol!
Lat/Lng: 52.0461, 1.1719
OS grid ref: TM176433