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We've tried turning everything off. I know because I was even clever enough last time to write some labels on the stupid fucking pipes.
Also the shower is working better now. Missus fucked around with it yesterday and I reckon she's loosened some limescale or something so it has much better flow rate again. It really is best to leave the womenfolk at home...
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Don’t underestimate limescale for restricting water flow. We had barely a dribble out of the shower when we moved in so got onto the water co, plumbers round, asked the neighbours how theirs was. On the verge of getting a power shower fitted when a handiman who was putting in a fan offered to check water inlet. It was full of limescale so he cleared it out and now it’s like niagra falls.
YMMV, but it may still be that the pipes do weird weirs things behind walls.
Turn everything off.
Hammering frozen sausages into the ends of the pipes may work too.