Was Khomeini a British agent from British freemasonry and Freemason Moslem Brotherhood?

NO, he was not.

First, the Muslim Brotherhood is opposed to Freemasonry. Muslim Brothers have attacked and destroyed Masonic Lodges in Egypt and several other countries. Second, if Khomeini was a British agent, he was the worst kind of agent in that he toppled a pro-British regime and replaced it with a regime categorically opposed to all British interests. Khomeini was also opposed to Freemasons, effectively hunting them out of the country. Khomeini also opposed the Muslim Brotherhood since the latter was a Sunni Islamist organization as opposed to a Shiite Islamist organization; this led directly to the creation of Hezbollah to be a Shiite option in the Islamist Militant sphere.