Neil Brown on Nostr: He has also been charged with possessing a PDF document of a kind likely to be useful ...

He has also been charged with possessing a PDF document of a kind likely to be useful to a person committing to or preparing an act of terrorism, contrary to Section 58 of the Terrorism Act 2000.

According to The Times, a document entitled "Military studies in the jihad against the tyrants - an al-Quaida training manual".

The prosecuarion may well be justified on the facts get, but s58 is, IMHO, worryingly broad:

https://www.legislation.gov.uk/ukpga/2000/11/section/58/enacted

https://www.bbc.co.uk/news/articles/c0qdwzel7vxo