Low Water Pressure

Have the monkeys fitted the shower with a stopcock or gate valve ? Is the valve fully on ? What size pipework have the monkeys used ? Is it kinked or compressed anywhere along its length ?

That reminds me, there are two sizes of 'ball valve' or 'ball o'fix' valves with internal diameters of 12mm and 7mm - the latter being much, much cheaper - so which one is the hired plumber going to fit? I only found this out (after fitting lots!!!) when a friend mentioned it as the possible reason for unbearable shhhhhssshhhhing noises in his house whenever a tap was turned on. Hugh

pressure/flowrate

Yes

It's same as standard copper, but plastic piping, about 9 / 10mm Outside diameter

No, unfortunately it looks a good fixing, we're just sorry we didn't actually get to run the shower while they were here .. though I guess they did, and that's why they " .. got called away to another emergency job, though it's all fixed and working ..."

The actual plumbing is now OK, I re-did it myself. There's no kinks, bends or anything to stop flow or pressure, it just appears that this older side of the bungalow has issues that are more than just the fitting of a shower, and it does seem that low water pressure is here to stay without ripping it all out and starting at the mains again .. ;) I'm really looking to see if there's any other way we can get a reasonable water pressure to this side of the bungalow, the litchen end is fine ...

I was going to ask whether it was a 'pressure' problem or a 'flow' problem? Partially clogged pipe? Or some obstruction such as an errant washer previously come loose from a shut off valve got into the pipes somewhere? Some six years later when I drained down our system found the screw and the rubber plastic washer (remains of the original major shut-off valve) and some grit came back down the pipe! Replaced main shut-off with a quarter turn ball-c*ck. Two cents.