A piece of news from the BBC reads as follows [emphasis in the original]:
The UN has said very little on the matter, apart from to insist it is immune from legal proceedings.
Now, I knew that any prepositional phrase must be followed by the -ing form of the verb, so I’d have expected the reporter to use “insisting”. Is it a correct usage? If it is, are there any other prepositional phrases that can be followed by the infinitive form?