I have recently found an article about the harlequin ladybirds (by Ken Thompson) with a picture, so I now know I have them in the garden (along with 6-spot ladybirds).
The article recommends we resist the temptation to interfere. We may squash native ladybirds by mistake, and the harlequin ladybirds are so well-established that we aren't going to have an effect on numbers.
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