This chart is very helpful https://www.britishbugs.org.uk/heteroptera/idcards/life_stages.html You have to pay close attention to the fine details though. Yours is a 4th instar going by the partial wing formation. They have an annoying habit of changing colour soon after moulting though so you're never sure if it's one species or just a freshly moulted nymph of another.
If you can keep your head, while those around you are losing theirs, you may not have grasped the seriousness of the situation.
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Doesn't look at all like a ladybird IMHO.