Bollocks. Sounds like I'm just gonna have to give him the go-ahead to plaster as it is and just ventilate as best I can, periodically.
What @Apone said. Had a very similar experience.
If possible, knock it down and start again - cheaper in the long run.
@ChasnotRobert started
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Bollocks. Sounds like I'm just gonna have to give him the go-ahead to plaster as it is and just ventilate as best I can, periodically.