The "redundancy" of the CPC in a ring does allow for a single fault ( broken CPC ) to occur without compromising safety.
One major advantage of a ring final is that continuity of Live Neutral and CPC can be tested at any point on the ring without the need for a wander lead back to the CU
With a radial the continuity of the CPC has to be ensured as there is no "redundant" CPC route in a standard radial. That is unless the electrician has installed a separate CPC from CU to the end of the radial to ensure that a single break in the CPC along the radial cable does not remove an Earth from any of the socket.
I accept that the "redundant" paths in a ring final will conceal a single fault from the house owner but at least the sockets are still safe with an Earth to all of them. A single fault in a radial may also go un-noticed by the house owner.
One major advantage of a ring final is that continuity of Live Neutral and CPC can be tested at any point on the ring without the need for a wander lead back to the CU
With a radial the continuity of the CPC has to be ensured as there is no "redundant" CPC route in a standard radial. That is unless the electrician has installed a separate CPC from CU to the end of the radial to ensure that a single break in the CPC along the radial cable does not remove an Earth from any of the socket.
I accept that the "redundant" paths in a ring final will conceal a single fault from the house owner but at least the sockets are still safe with an Earth to all of them. A single fault in a radial may also go un-noticed by the house owner.