British MPs don’t have the capacity to weed out spies

As if critics of Britain’s politicians were short of material to bolster their view that the Palace of Westminster is a hive of misconduct, they can now claim it is a threat to our national security. A House of Commons researcher has been arrested on suspicion of spying for China. He proclaims his innocence, but the sound of sharp intakes of breath, pearl-clutching and the clutching of petticoats is almost overwhelming.