Paul, you raise an interesting few points.
In the US, the common practice---practice, mind you, not any form of 'code'--- is to mark the feeders in the order Black-Red-Blue.
Likewise, it is also the practice to follow this pattern from the top down for the breakers.
Looking at the breakers, I see black-red-black-blue.....and some yellow farther down.
This suggests that the person who connected these wires had no formal training; that is, had not been taught the 'ground rules." It is in stark contrast to the neat pipework and clean mounting of the panels. I wouldn't be surprised if we're seeing the work of two different guys.
I'd also like to see just how much induction heating occurs here.
