The same sort of split-neutral-bus panels have become common here as well. The RCD-protected circuit neutrals must be wired separately from the non-protected loads otherwise the breaker will just keep tripping.
A common arrangement here for new installations using TN-S or TN-C-S supply systems is for lighting and a couple of other "essential load" circuits, e.g. freezer/fridge or heating controls, to be on the line side and everything else to be fed through the RCD.
On TT systems that would necessitate the use of two RCDs. It's more usual to just see a single bus panel with a single main RCD on TT systems.
