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Follow Xenon's comment I got more concerned and actually phoned up the manufacturer. I was very please to get a response. Apparently the join along the wall is bad but the gelcoat is thick enough:

Hi, I'm after a second opinion a new GRP bay roof we've had installed. We live in a 1938 semi which had the original lead on the front bay and previously had a plug hole for water to drain out of into the gutter. Because of the original design the roof had no natural pitch for water to...