Without wanting to get into a blaming game post number 6 seemed to give me assurance:
"
that looks good to me."
Presume the setup of what is currently installed is good?
Maybe it was my pictures that were good
"
both those showers should be on 40A for the upstairs shower, as long as the cable is nowhere covered in insulation, and a 40A or even a 50A for the downstairs shower. simple job to get him back to swap out the MCBs."
So, should be on higher amperage rating but no has to be for safety?
"as a side note, though, 32A MCBs will withstand the 4A t0 8A overcurrent for far loger than it takes to have a shower, so even as it is, it's safe. might get the occasional trip on the 9.5kW shower, but unlikely. the lifespan of the 32A MCBs may be shortened somewhat as they are running at their rated limits."
The wording here states it is safe.
We've never had a trip.
This setup has been in place for 4 years near enough with daily use.
I guess, all the answers point to that the setup is "safe", though perhaps not ideal.
At the end of the day, as I mentioned, this was all put in by a competent electrician as far as I know.