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@Airhead
I does get confusing because we all tend to make assumptions based on experience. I work in a lot of houses that don't have RCD protection so I usually assume the worst case scenario. However it would be easier to fit an RCBO if there's currently no RCD than comply with the 50mm depth requirement in lots of cases.
The B&Q example doesn't really mention RCD protection but maybe assumes it based on the wider range of households that have it. The rule regarding RCD protection is possibly more recent than the B&Q wiki too.