In an earlier contribution to this discussion,
TheScullster wrote:

Hi Guys


One of my future projects is an upgrade of the downstairs loo.
Currently, this loo is ideal for those more stubborn deposits, as it
is a 1970s full flush low level cistern.

Having already been bitten by these pathetic new 6 litre cistern/pan
offerings that don't rinse the entire bowl, my thoughts turned to the
following.
To ensure that we have one toilet that still works
effectively/hygienically I was considering:

Retain the existing cistern.
Pipe the overflow down the outside of the cistern and into the flush
pipe (overflow is currently to external drain and needs to be
internal!). Recondition cistern, ie replace all internals.
Box/wall in cistern and fit a modern back-to-wall pan.

This way the room can be re-worked to modern spec without loss of
functionality.


OK - The Questions

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?

Can anyone see anything technically wrong here?
Will a modern pan work with an old cistern?

Could be a problem. Most modern pans which I've seen are designed to use a
close-coupled cistern, and have an extension at the back with an
upward-facing hole, and a rubber doughnut to connect to the cistern. I'm not
sure how you would connect a low-level cistern to one of these.

Do fittings exist to pipe overflow into flush pipe or would this have
to be a home bodge?

I don't know about connecting to the flush pipe, but I have seen overflow
pipes - often in hotels etc. - which discharge into the pan. The discharge
end is very flat so that they can go over the back lip of the pan and under
the seat. Alternatively, if you replace the syphon flush with a push-button
flush, this will automatically have an internal overflow.
--
Cheers,
Set Square
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