If it's just a toilet and no bath or shower in the room.
It would be allowed now! cable needs to fixed secure but can't see a problem for 1976. Would have been 15th edition then before my time? but likely that it would have been permitted.
That type of arrangement is actually quite common.
All of those vile Saniflow devices require an FCU, and it is usually positioned right next to the Saniflow unit, which of course is directly behind the toilet.
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