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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.
I guess the sensible approach is to do an EICR and then fix the recommendations and if a new consumer unit is required then sort that out. I don't really want to install something that's going to be out of spec in a few years though (buy cheap, buy twice)