Iran charged Friday that British spies are operating in the country and said a Briton jailed in Tehran for more than three years had confessed to espionage activities and revealed anti-Moslem activities in other Islamic nations. State-run Tehran Radio made the allegations as Britain moved to expel about 30 Iranians following the break in diplomatic relations with Iran triggered by the controversy surrounding Salman Rushdie's novel "The Satanic Verses." The morning Tehran Radio commentary, monitored in Manama, Bahrain, said British spies were operating in Iran under the guise of "Western correspondents, embassy attaches and businessmen." It said Iran would take "every measure to remove and unmask these enemies of Islam."