Any idea what plant this is please?

Hello,

Can anyone identify this plant please, or is it usually considered to be a weed? It was in a raised bed area that was being renovated, and since I'm pretty new to gardening (apart from cutting lawns and hedges!) then I thought I'd save it in a pot, just in case it was worth keeping.
Many thanks
Brian

 

It is one of the many species of willowherb.
Recommend you get rid of it asap before it seeds.