Stanhol - not sure how long the blight spores can last but I would think you need to look at some sort of sterilisation fro the ground you are putting the greenhouse on.
Jeyes fluid, if it is still available, would do the job or a good bonfire!
Sounds daft, but a good bonfire will bake the soil and kill anything (and I mean anything) in the top couple of inches of soil. Obviously do it before you put the greenhouse up, you won't have any glass otherwise!
Terry
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