Iran declared Britain’s navy and air force terrorist groups.

MI6 now falls under Iran’s espionage law as a hostile group.

Iran’s Supreme National Security Council ordered it, citing Britain’s 13 July designation of the Revolutionary Guards.

The foreign ministry accuses Britain of joining the US-Israeli war by lending bases and logistical facilities.

The ministry warned Britain will bear responsibility for the consequences, with the measures effective from 1 November.

How each outlet framed it

drawn from 60+ reports worldwide

Middle East Eye
frames the designations as reciprocity under international law, citing UN Charter sovereignty principles and holding London responsible for consequences
TASS
cites the espionage-penalties law's Note 2 of Article 1 as the legal basis for classifying MI6 as a hostile group
The Times of India
attributes the Royal Navy and RAF designations to ANI via Indian wire, placing them in the context of Britain's July IRGC decision

Sources: Middle East Eye, TASS, The Times of India