blight perhaps?

just found these black spots on one of potatoe plants. is it the dreaded blight. i have three sacks with spuds in only one has the black spots.
i have cut of the affected foliage and put it in the rubbish bin. is it likely to reappear and affect the other plants.
all advice appreciated

 

I know nothing about potatoe blight, but this fact sheet looks useful

http://www.organicgardening.org.uk/factsheets/dc17.php

 

Doesn't look like blight but I could be wrong.

Have the brown spots turned into little holes ?

 

Hi Grubby. I think it is too early for blight so is probably a form of blackspot, but the way our growing conditions are changing who knows? David.