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He flagged that it wasn't draining into anything, this was their subsequent solution.
@Dramatic_Hammer that was one of the things I was concerned about. Was also wondering whether it may create some kind of temporary vacuum as the toilet flushes as we've had a few error messages on the boiler (no idea if they're linked though).
Was it flagged up by your surveyor?!
Google seems to think that as long as they can vent in to somewhere that will carry the water away then happy days.