Can anyone identify this plant please?

not sure, could it be a tobacco plant?

looks like nicotiana, but the leaves leave me doubting a little.

snap! a lot of the garden ones do have smaller leaves like this so seems most likely

yes id go with nicotiana [tobbaco] too. the seed is very fine so it will have blown in from somewhere. lovely freebie.

It isn't hardy, though, sadly. You could collect the seed for next year!

Thanks for your help everybody.