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Blight affects both Tomatoes and Potatoes and thrives in warm moist conditions, the spores are carried from plant to plant by wind or rain. Try and avoid overhead watering and earth up potatoes deeply to provide a barrier from wind blown spores. You can protect both by spraying with Mancozeb or a copper based fungicide. In wet seasons spray plants befor the blight appears. With a new Allotment, unless blight has been a problem you should be ok.
Have Bordeaux on standby after loosing all my lottie toms last year! PLus my darling Ava is building me a roof to go over the top of my toms to try and help (as seen in Kitchen Garden Mag Feb edition I think)