What am i? (white flowers - black berries)

Hello all

i threw down some horse muck about a month ago an quite a few "things" have grown since. once plant has especially caught my eye

any ideas what it is?

apologies for the quality of photo's....damn blackberries!!











as you can probably tell from the background the garden is still like a bomb site....

could this be "Black Nightshade"?

thanks all

 

fantastic!

thanks for the reply, i was worried that it was poisonous as our border collie seem to enjoy sniffing the plant/ weed. i will pull it up

plus i didnt want to pull it up before i knew what it was!

thanks once again