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    Is this a 'Roof Sweat' problem and what is the answer?

    Any vapour barrier should always be fixed to the warm side of any construction. The problem is almost certainly a case of condensation. Pictures will confirm it if you manage to upload them. Mould spores are constantly in the air, for mould to germinate there must be a source of moisture...
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    Flat roof leak.

    Try reading 'felt and torch on roofing - a practical guide' amazing book for DIY and builders& roofers. This will point you in the right direction.
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