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Is this blight?

I am growing potatoes in 4 bags. They started off in the greenhouse and were moved outside about a month ago. I have been topping up the compost as the leaves show and the bags are now pretty much full.
I have just noticed that some of the leaves are looking ropey.Is this the dreaded blight?
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Have they been frosted?
In the sticks near Peterborough
Sorry, it might help if I post the photo


No frost. I wonder if over-zealous watering might have anything to do with it.
You're in the Nottingham area? - there was a frost in Nottingham over the weekend http://www.timeanddate.com/weather/uk/nottingham/historic
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
looks like frost to me! too early for blight I would've thought, tho you can check on the web to see if its in your area. new leaves should come thru, I had the same problem one year, im in the midlands too. wish the frost would get lost!
Oops! I must have missed it
Thanks nut and Dove and CG
Lay newspapers over them at night, if you have no fleece. We had a frost last night, and another forecast for tonight.
Cover it with fleece - that's what the farmers do.
OR
as a cheaper solution if you don't have any fleece, earth the plants up as much as possible and then spread a few pages of newspaper over the top at night (remove in the daytime - replace each evening) and hope it's not too windy!
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
Or use old sheets. We used those to protect plants from frost when I was a kid. You could even push a few branches in near the plants to keep the sheet up off the leaves, and weigh the edges down with rocks or more sticks.
Thanks to all of you for your advice and reassurance. Just off to order a copy of 'Idiot's guide to British weather'