plant in UK garden

Tall plants appeared this year. Don't remember if I planted them so would like to know what they are. Metre tall and beginning to flower but can't see any colour yet. See link below for photo.

Thanks.

https://www.dropbox.com/s/vuzrfbv7wympf4r/IMAG1507_1.jpg

 

Some kind of Solanaceae (tomato or potato family)

 

Really? Not like any tomatoes or potatoes I've seen around here- no red stem and leaves.

 

Looks like a Lapsana to me.

 

Ron's right, there's a similar photo on this page: yellow-flowered Asteraceae.

(I wasn't thinking it was a tomato or potato by the way, but I thought perhaps a relative given the overall "roughness" to the plant, the hairy stems, and the leaf shape)

 

Thanks Ron and Daniel. I did in fact take a look a couple of hours ago and saw the beginnings of yellow petals so looks like it is a Lapsana as you suggested, Ron.