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Gave it a clean off in vinegar and after a puff or two managed to blow air through it

Yeah positive ... confirm mains stop cock kills all cold in the house after a min or so. Had a chat with plumber today and he thinks next step is to replace the non return valve in the shower unit. Just got home and the mrs has bought an endoscope and wants to stick it down the pipe !!! ‍♂️

Unvented mega flow for hot. No tank, mains pressure good.

Scratching heads a little on this one. Not sure the two issues we’ve experienced are related but posting all info here in case it’s relevant. Had a en-suite bathroom put in as part of an extension in 2016. Sink, shower and loo. About 6 months ago the cold tap feed on the sink slowed to a...