Blight has been spotted on a number of plots. There is no cure for potato blight when your plants are infected. The first action to take is to cut off all growth above soil level and burn it as soon as possible. This will minimise the infection on your soil and also reduce the risk of you passing potato blight on to neighbours, including neighbouring farms which could ruin their crops.
Please check your crop urgently. If you see any sign on your plot please take the above action without delay.
For more information please see the Pest & Diseases section of this web site.