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I think they've been trying to phase in RCBO's for a long time. It's obviously more convenient if the RCD only trips on the circuit it's protecting rather than leaving you in the dark because the kettle has some water in the base. As a landlord it buys you time if you have a fault on one circuit but you can work around it for a couple of days rather than having to get someone out immediately to restore power to half the property.
hippy
Airhead
Yes, just interesting that he didn't offer all RCBO's in the new consumer unit route. Personally I would have all an all RCBO setup if I was putting in a new consumer unit. They are quite a bit more expensive though.