Notwithstanding the author's clear bee in his bonnet (come on, El Reg, at least try for a whisker of impartiality), he misses the point entirely about the 'Protection from Harassment' letters.
In order for an individual to be convicted of a harassment offence, they need to pursue a course of conduct that they know or ought to know is unwanted. When you've got an ongoing issue between two parties, the police will issue a letter on behalf of the victim that basically says that any further contact is unwanted, and removing any doubt on that matter.
The letter isn't an order, and in of itself binds no one to anything. If you're going to ignore it, however, you're going to be hard pushed to defend further contact in the face of it; noting that it's issued on behalf of the victim, and it's the victim who gets to define 'unwanted'.
In order for the letter to be written, you've got to have an allegation of harassment in the first place. That results in a crime report, and that's going to remain on record as part of the Home Office counting rules. The fact that the letter has been written needs to be recorded, and the letter is going to be filed, what with it being evidence in a criminal matter.
Records are generally kept for seven years because that's the cut off for civil litigation - just imagine the issues if an officer is obliged to destroy his notes that describe an arrest of someone subsequently cleared or not proceeded against, where force was used and the subject wished to launch a civil claim.