And I think it is also clear that the CAA have no wish for this to become commonplace for whatever reason so there is no incentive for them to relax their stance. It just ain't going to happen here.
In my experience, the CAA are quite open to changing policy and rules where they can when presented with a reasoned and sound argument for the proposal. But 'It happens elsewhere' ain't going to cut it. The CAA is interested in assuring safety - PCL does present some hazards (none of which are unmanageable). If anyone really wants PCL, why not present a good case for allowing it rather than going around in circles on an internet forum?