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I find the only way to stop blight is to burnt them, but be sure its blight as there can be other blight looking patches that can appear on tomatoes, something you can do when planting is to give your plants room and when growing pick off the lower leaves which help air pass between the plants, there was a copper based product I used to spray yearly which did help, think its probably banned, maybe had too much copper in it, Some years when its less wet are better and think there was one maybe two blight free, been on an allotment I always get blight especially with my outdoor plants so I try and grow early and harvest everything before blight attacks, I then ripen the fruits at home with some careful inspections, I'm still alive so maybe its not as dangerous as we are lead to believe,
P.S just read the other answers so nothing new from my post, (yes I was referring to Bordeax forgot what it was called), also confussed why this was organic friendly.
can anything stop the blight?
I've been spraying diluted milk on various things as a mild anti-fungal, but read somewhere it can cause other problems in tomatoes. the garden really does seem riddled with fungal spores of all kinds but the milk seems to be helping a little.