I cannot find this on the BBC web site but I heard on Radio Ulster this morning that if cars have three or more outstanding parking fines registered to them they can be clamped and towed away. This is an attempt to prevent people ignoring parking fines and apparently they will have received multiple written warnings before clamping occurs.
Now it might be inappropriate for me to tell everyone this but there is one solution to this problem (apart from not getting parking tickets). The old Citroen DS with that weird gas suspension apparently cannot be clamped when parked, it sits too low to get a clamp on. Of course that does not prevent it being towed away and from memory they were so unreliable anyway that the chances of actually getting anywhere in them were pretty limited. Sadly Elenwe regards them as too odd and will not let me buy one.