They can't arrest you or issue an arrest warrant. You are entitled not to pay the fixed penalty and then the PF would issue a criminal citation or, as you say, sometimes they don't get round to it. Happy to discuss further but you don't have to worry about being taken into custody. I hope that helps. Please leave a positive rating so that I am credited for my time.
Is a criminal citation a order to attend court as when I have avoided the police when they have come to my door in the past there was no citation issued or left at my house. I was of opinion that the police calling at the house was to give issue citation personally or charge me so as PF could consider whether merited court appearance
It is an order to attend court and plead guilty or not guilty. It could be delivered by the police-but the PF can also issue by recorded delivery post.