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It could be condensation as nylon is not breathable and will condensate without ventilation. Was the inside of the roof/ walls wet? I suppose the only to be sure is to put it up and soak it

More than likely to be condensation, there have been some severe dips in tempreture overnight recently, and after a relatively warm day in the autumn sun, where contents would have warmed up and held the inside tempreture at a few degrees higher than the outside night time temps, then condensation is bound to form. 

We have got its big brother the 260, but the only time we get any real problem with condensation is if we heat up the inside if we are using it as extra living space on a cool evening when we have visitors to stay.

Julia