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Rotten cabbage smell from shower drain

I recently moved into a seventh-floor flat and every couple of days a terrible rotten cabbage smell comes from the shower drain. I'm not sure if it could be related to communal pipes and upstairs neighbours using their bathroom. My question is, is this something that I would need a drainage specialist to investigate or would a plumber be better?

Coating on roofs

What's your opinion of the coating used on roofs? I Was told it will make my roof as new, but also heard it could cause dry rot. Can I have some advice?

Removal of loft insulation

Who can I ask to remove old insulation from the roof? The insulation is attached to the roof lining, and is causing condensation. Is this something a roofer would do? Or do I need a general builder?

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