You have two plants there. I think the one with the bigger leaves looks like a nightshade and the smaller one at the back could be a Goosefoot, or a Chenopodium. But I am not sure about either of them. I think you need to see the flowers for the bigger one.
Thank you for your responses. I have posted another couple of photos for information and agree that the tall weedy one is Chenopodium. If you can identify the other plant that would be helpful. Both came out of a seed packet labelled as Nemesia. I certainly won’t be keeping them though.
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photo attached.