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Never actually seen anyone install an AFDD though, a full RCBO/AFDD board is like £1800 lol.
And AFDDs don’t work on rings either!
Nef-
Lot's of fun to be had with AFDDs. At least they are optional for the moment. I like RCBO's, very handy for problem solving on some of the older installations I come across. I don't do any board replacements but you see a lot of smaller boards in London properties. 8 or 10 way is quite common. That would be a lot less money of course.
Airhead
One the one hand you can never have to many RCD's, on the other there can be an issue when you have more than one RCD that you don't know which one will operate. During the course I took the teacher was quite keen on only having one RCD in each circuit.
These days the regs all point to RCBO's or AFDD/RCD combined per circuit in the consumer unit. It's now unlikely that anyone will have combined circuits in a single RCD because the combined earth leakage would be too high.
AFDD - Arc Fault Detection Device