New building regulations for bathrooms - Unbelieveable.

[divine]

They're not. I've just had a quick skim read and I don't think you're understanding the 125l/d/p thing. Saying it is a 'regulation that you cannot draw more than 125' is misleading and not true.

They're not gonna have SWAT teams smashing through your windows the moment you go a drop over 125. In fact, they won't even be checking.

It's a construction guideline to promote more efficient new builds. It's a target of theoretical usage to meet.

1.1
The following document sets out the Water Calculation Methodology for assessing the
whole house water efficiency of new dwellings. The calculation method is to be used
to assess compliance against the water performance targets in Building Regulations
Part G and the Code for Sustainable Homes (referred to in this document as the Code)
as set out below. It is not a design tool for water supply and drainage systems. It is also
not capable of calculating the actual water consumption of a new dwelling. Behaviour
and changing behaviour can also have an effect on the amount of potable water used
throughout a home.

Building Regulation 17K requires that the potential consumption of wholesome water by persons occupying a dwelling must not exceed 125 litres per person per day when calculated in accordance with the methodology set out in the CLG's document 'The Water Efficiency Calculator for New Dwellings'.

It's basically to ensure new builds aren't wasteful, nor promote wasteful behaviour.

It's not a limit being applied to anyone.