>> Apparently an external cistern overflow was a requirement before 2000.
There was some issue with risk of contamination of the cistern and water being siphoned back into the public supply. Developers plumber fitted on in our ensuite where an overfilled cistern would cause a float to dump the cistern contents into the pan. The instructions said it required consent from the water provider. I doubt this was obtained and indeed the overflow pipe was left in place so any overfill would actually spill onto the floor.
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