It's a burying beetle brightly coloured bands of orange- red on their wing cases, bright orange bobbles on the ends of their antennae widespread throughout all of the UK.
"A society grows great when old men plant trees whose shade they know they shall never sit in."
To my knowledge they are just beautiful and do no harm. They have recently spread to the UK from Europe, so are still quite unusual here (assuming you are writing from the UK). I think they live on the seeds of different plants, such as mallows and hollyhock. Birds don't predate them as they taste bad, as the markings might suggest.
Hello Fire, yes I am in East London. Am surprised they came into my garden as don't have Mallows or Hollyhocks. Found them on Crocosmia. Disappeared now but will keep an eye out for them as there were two that looked as though they were mating.
I think it is the cinnamon bug, yes, (above) not the fire bug. The fire bug seems to have a solid black triangle on its shoulders. Which the OP's does not.
Granny R
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It's a burying beetle brightly coloured bands of orange- red on their wing cases, bright orange bobbles on the ends of their antennae widespread throughout all of the UK.
https://www.naturespot.org.uk/species/common-sexton-beetle
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Birds don't predate them as they taste bad, as the markings might suggest.
Corizus hyoscyami
https://www.britishbugs.org.uk/heteroptera/Rhopalidae/corizus_hyoscyami.html