Any test results? Only thing I can spot is by looking at the switch disconnecter the polarity looks wrong as live is usually in that configuration on the far left hand side IIRC.
Second thing what about the earth bar, looks as if that is split in two or is it just the reflection in the photo or my eye sight playing up again?
Third thing no conductivity between the lock nut on the swa gland and the metal clad CU. No paint scrapped off etc to ensure a good electrical contact. This then leads me to no earth on the metal clad CU. I doubt there is any resistance reading between the case and the earth bar.
What do the circuits feed? Looks like a new install so I suspect RCBOs might be required depending on the circuits they are supplying.