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How many square metres does the new roof cover? and did the Architect specify a particular brand of fibreglassing system? Some are more flexible than others and a south facing roof is going to get the sun (if we ever have a summer again in the UK) so thermal expansion might, if not already needs...

Only thing I can recommend is a fungicidal wash, but i'm guessing you might have already tried that? http://www.diy.com/search/results/?question=fungicidal+wash

A high quality GRP roofing system applied to a quality deck with the appropriate insulation shouldn't give you any problems with noise.