I have written to the ICO again...
When the PECR came in, we raised the issue with the ICO that the mobile operators were not providing anonymous call rejection service.
At the time, the mobile operators, and OFCOM, and the ICO were saying that the means reject such a call was to "press the red button on the phone".
This provided the "user" with means to reject the call, but not the "subscriber" as required by the regulations.
At the time, in spite of the clear breach of the regulations by all of the mobile operators, the ICO did not take any action.
We now have the situation where, on my iPhone, when a call comes in, I no longer have any option to "reject" a call. There is no "red button". At best I can silence the call but not "reject" it as per the regulations.
Once again, as per section 32, I request the Commissioner to exercise his enforcement functions.