Covered already in this instance, thoroughly:

'The judge said in his ruling that he had examined “raw underlying intelligence material” before deciding there was not a “real and immediate risk” to NX121 or his family if his identity was made public.

Lucraft said the three-month delay in naming the officer would allow for “the imposition of any additional mitigating measures to be put in place.”'

Source: https://www.theguardian.com/uk-news/2023/oct/30/met-officer-...