In an earlier contribution to this discussion,
TheScullster wrote:

"Set Square" wrote

Other than the fact that this does not conform to current regs (but
won't be visibly flouting the rules) -

Which regs do you have in mind?

I may have been wrong in mentioning regulations applicable to existing
installations.
But, toilet manufacturers are now using Defra guidelines to design
cistern capacities and assess flushing performance.
As most users of the new offerings are finding, these recommendations
lead to woefully inadequate flushing and, just as importantly for
people with inquisitive children, bowl cleaning.

Phil

Ah, I see - the ones about saving water. As you say, with a hidden cistern,
you're unlikely to be found out!

It's just possible that, even with a reduced amount of water, you could get
adequate clearance if you could dump it from a great enough height. It's
really flow *rate* rather than flow *volume* which matters - as witnessed by
the effect of pouring half a bucket of water directly into the pan.
--
Cheers,
Set Square
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