Paul writes: The Cinnamon Bug (Corizus hyoscyami) is a dramatic looking scentless plant bug and not usually confused with anything else in the UK. It’s about 9mm long and easily stands out against the green foliage it likes to feed on. It used to be quite rare and only seen in southern England but is now increasing its range and becoming more noticeable. I saw several last year in wooded rides in the North York Moors. This one was seen in Wykeham Forest in August. The bug overwinters as an adult so can be seen from spring onwards. New generation adults begin to appear in August so this is when they are most numerous.
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But note the similar looking new arrival Arocatus longiceps – https://www.britishbugs.org.uk/heteroptera/Lygaeidae/Arocatus_longiceps.html