He was arrested on 28 November and has been charged along with Mohammed Aqib Imran, 21, who police believe was trying to join Isis.
It is learnt that two suspected men were conspiring to attack Downing Street armed with an improvised bomb, suicide vest and knives.
Addressing the Cabinet, Mr. Parker reportedly said Isis had been defeated in Syria and Iraq but was continuing to orchestrate attacks on the UK. They are due to appear in Westminster magistrates' court on Wednesday.
"This is something which has been pursued over several weeks at least by Scotland Yard, MI5 and West Midlands Police". During the meeting, Parker revealed that British intelligence had foiled nine terror plots in the past 12 months.
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Britain has suffered five terrorist attacks this year, in London and Manchester, in which a total of 36 people have been killed.
"In retrospect, the intelligence can be seen to have been highly relevant to the planned attack", Anderson said. The same report found that the ringleader of the June London Bridge attack was actively under investigation at the time.
In 1991, the IRA managed to breach security, launching a homemade mortar bomb attack on Number 10. The then prime minister, John Major, was inside but was not hurt.
The nearest the IRA got to killing a British prime minister was in 1984 when they targeted the hotel Margaret Thatcher and top officials were staying in for that year's annual Conservative party conference in Brighton on Britain's south coast.