Any ideas what this is?

I’ve managed to grow something from seed, I thought they were delphiniums and labelled them but now they’ve grown a bit I don’t think they are! Hoping someone will know, they look like annuals of some sort I’ve taken the photo so you can see the purple underneath. Apologies the pictures are sideways. They’re in a 6cm pot.


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Cambridgeshire/Norfolk border.
A good gardener's eye sees more to be improved. Robin Lane Fox