MI5 has issued new guidance warning UK politicians about the increasing threat of foreign espionage from countries like Russia, China, and Iran targeting Britain's democratic institutions.

The advice urges politicians, including MPs, peers, councillors, and parliamentary staff, to stay vigilant and trust their instincts, especially during overseas travel or financial dealings.

Security Minister Dan Jarvis emphasized the government's concern over threats to Britain's democratic security and reaffirmed their commitment to protecting Parliament from espionage activities.

Commons Speaker Sir Lindsay Hoyle expressed outrage over the collapse of a recent espionage trial, criticizing the perceived inadequate protection for MPs and announcing plans to update security guidance for parliamentarians.

The trial's collapse has heightened political tensions, with accusations that the government blocked evidence from prosecutors and concerns that parliament has been infiltrated by foreign spies, including infiltration of MPs' offices.

This incident follows the failure of a high-profile espionage trial involving former parliamentary researchers, which was halted amid allegations that the government withheld crucial evidence, raising national security concerns.

Recent cases of foreign interference include the trial of two alleged Chinese spies linked to a parliamentary researcher and senior Conservatives, along with warnings about individuals like lawyer Christine Lee and ex-MEP Nathan Gill.

MI5 highlighted the case of lawyer Christine Lee, accused of political interference on behalf of the Chinese Communist Party, and warned that other states may attempt similar influence operations.

The guidance follows recent cases, including the collapse of a trial involving alleged Chinese spies and allegations of political interference by individuals such as Christine Lee and Nathan Gill.

MPs and government officials are urged to follow new guidance, including registering foreign influence activities under the Foreign Influence Registration Scheme, to promote transparency and protect democratic processes.

MI5 Director General Sir Ken McCallum stressed that foreign interference undermines UK sovereignty and citizens' security, urging everyone involved in democracy to take protective actions.