Personally I wouldn't want to use a shower which wasn't on an RCD.
According to the Regs you CAN install a towel rail in Zone 1 of a shower , the connection unit however is subject to water ingress .
I would have refused to fit it to be honest , whatever the Regs say . Arse covered , let someone else do it . Seems stupid anyway as the towels will be getting wet all the time .
The rail would need an isolation switch somewhere in the bathroom .
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