Help - I hold brown results on the leaves of my potato plants? They are Maris Piper and they are about 1 foot towering

They are Maris Piper and they are about 1 foot towering
Passionfruit no fruit?
Answers:    Hope its not blight, if it is you have have it for this crop. This disease caused the Irish potato famine. Could be twist burn or cold nights that enjoy singed the leaves.
Take a look at;

http://www.ag.ndsu.edu
Rock Vs. Sod?
It's possible you have blight.

See here for detailed descriptions of symptoms, and organization of the problem.

http://www.hort.uconn.edu/ipm/veg/htms/b...

Unfortunately, if you conclude it is blight - planting resistant variety is really your only defense.