Man is known to have had unescorted access to large parts of the Westminster estate
MPs have reacted with alarm after it emerged that a parliamentary researcher with links to senior Conservatives and potential access to sensitive information had been arrested over allegations of spying for China.
The man, who is in his 20s and was arrested in March along with another person, is known to have held a parliamentary pass, allowing him unescorted access to large parts of the Westminster estate.
