Julian Valente Pereira used rolled-up paper, brown masking tape and string to create his fake device.
Rachel Toney is security-cleared to represent Abu Faraj al-Libi's interests at secret hearings.
Juan Joseph, a former MI5 IT contractor, shared information with a foreign state but was found "not guilty by reason of insanity" by a jury.
It comes after a BBC investigation four years ago showed the agent used his security service role to abuse his partner.
Julian Valente Pereira, 32, staged the protest at Thames House a day after his asylum bid failed.
In September MI5 conceded it had breached Vincent Kearney's source protection and privacy rights by accessing his communications data.
Julian Valente Pereira, 32, is accused of placing a mock explosive outside Thames House.
Can the state, especially when it is implicated in killing, be trusted as the arbiter of what should remain confidential?
Jon Boutcher was speaking as the PSNI launched a recruitment drive for new student officers and custody detention officers.
