"the Protection of Freedom Act 2012 can be used from 1 October 2012 to demand from the registered keeper the name of the driver who was driving at the specified time"
That is an inaccurate summary of Schedule 4 of the Act. There is no obligation or compulsion within the Act for the RK to name the driver; rather, the Act states that, where conditions are met, liability for unpaid parking charges reverts to the RK, i.e. 'the creditor has the right to recover
any unpaid parking charges from the keeper of the vehicle'. This applies:
1. when 'unable to take steps to enforce that requirement against the driver because the creditor does not know both the name of the driver and a current address for service for the driver'
- or -
2. when the identity of the driver may be known but the parking charge remains unpaid after 28 days of the notice to keeper being given.
http://www.legislation.gov.uk/ukpga/2012/9/schedule/4/enacted