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It might be possible to narrow it down a bit if you could tell us what plant this is. Looking at it, is it Horseradish? If so, my guess would be Large White.
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They were on a Buddleja leaf
Seems more likely now to be Butterfly Eggs giving the plant would make a great detectyive mystery though ;-)
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Also whether they where elongated or more rounded , interestingly in passing, although I Do NOT think these are Sheidlbugs Sheildbugs seem to lay there eggs in multiples of 7 . some species have an operculum for hatching the developing Nymph. Tachnid eggs tend to be laid on a living host Matt might say more. Agree with Matt likely Ladybird or beetle even . keep an eye on them and let us know :-)
Fairly sure these are elongated eggs.
Shieldbug eggs eggs are more spherical and even viewed "end on" appear rounder than these.
Not seeing any "ribs" on these eggs, so they may not be Large White after all. Possibly a batch of ladybird eggs?
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