I can't think where I found out that it was a 'should' rather than an
'is', but I beleive it to be so, but welcome to be corrected.
Note that a thermostatic bath/shower mixer unit will _require_ the
supply pipes are arranged according to the norm.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
I am very irritated by this 'standard practice' particularly in the
kitchen, where I pick up the kettle in my right hand and have to cross
my left over it to fill it...same for large heavy sauxcepans.
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