The government is facing renewed calls to label China a threat after the arrest of a parliamentary researcher on suspicion of spying for the superpower. Deputy Prime Minister Oliver Dowden was delivering a statement on the matter in the House of Commons. Earlier in the afternoon, Speaker Sir Lindsay Hoyle warned MPs against going into details on the matter – or naming the suspect who was arrested – during the debate. Politics latest: Deputy PM giving update on 'China spy' allegations A slew of Conservative MPs – some of them sanctioned by China – shared their displeasure about the fact…