Paulottie, I think the comment about blight being rarer in the north is not the case now. We have blight fairly regularly here in the Manchester area, it's probably due to all the lovely rain we get (!) & the warmer temperatures in general nowadays ( another global warming effect?) Last year was awful because of the very wet summer & I lost most of my tomatoes to it & only managed to save a few which were small plants I'd still got undercover.
I believe growing tomatoes in a greenhouse offers a lot of protection but last year some people even found it on those too. I don't have a greenhouse so have to take my chances & only grow early potatoes in pots outdoors & have managed to harvest them usually before blight strikes.

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Into every life a little rain must fall.