It looks like a willow herb to my eyes, pull it up Alex.

O.K. Thanks Pimpernel.

I think the leaves are wrong for Willow herb? Try Enchanters Nightshade Circaea lutetiana? But get rid as it is a weed.

I think its an evening primrose. I'd wait for it to flower. If it has tiny white flowers (the nightshade) or pink ones (willowherb, chuck it out before it seeds. If it has big yellow ones you can decide whether you want to keep it (they do self seed but not agrgressively)

It isn't an evening primrose, Steragram, because I've got them all over my garden and they're not like tat at all. I don't think it's a willow herb either, Alextb, so I would suggest you do as Steragram said and wait to see what the flowers are like, then put a photo of it again and see if we're ant the wiser!! Don't pull it up, as I'd be quite curious to see what it turns out to be! Annie

I was thinking that it looked like a young Four O'Clock (Mirabilis jalapa).

Hi Tugb - if it is a Four O'Clock thats not a weed is it? Would you say quite a desirable plant?

It seems that nobody seems toknow what this could actually be. Therefore, I will leave it, and see what appears. I will post a picture here when it flowers.

Thanks for the suggestions.

It is situated in a deserted part of the garden as it is hard to grow anything there. The soil dries out ever so quickly and anything planted there usually dies apart from some weeds.

I may have planted something there and forgotten about it.

If as Tugb suggests - it is a Four O'Clock then they are draught tolerant.

Anne, I have them too but have a rubbish visual memory and didn't go outside to check. So have just been up the garden with a torch and now withdraw the suggestion!