Ok Uksparx, i'm going to let you in on the dirty little afci secret. They are no more than what your RCD's already are. AFCI technology is based on time honored toroidal coils
This is the heart of your RCD's
No matter how much electronica one places in line with a toroidal, it will all only sense what a toroidal can sense
Our testing labs devised a 15KV 'simulator' , which energized a piece of zip (lamp) cord , with a cut in it AND wrapped in flammable tape to pass a 'series arc' test here
The rest is afci "combination" history
I would like to think your country has a tad more integrity in it's validation of consumables
~S~