COPS probing allegations of Chinese spying have raided the home of a former aide of Labour peer Tom Watson.
James Robinson, now a political consultant, said police officers had searched his property.
He confirmed he understood the visit had been part of the operation which has led to three arrests over alleged Beijing-backed espionage.
Mr Robinson, who is married to ex-Labour MP Gloria de Piero, has not been questioned, detained or arrested as part of the investigation.
The former journalist worked for then deputy leader Lord Watson between 2015 and 2018.
He said last night: “Naturally, I co-operated fully with the police.
“And I will, of course, continue to do so as long as their investigations into the possible wrongdoing of others continues.”
“I would like to make it absolutely clear that I have neither been detained, arrested nor questioned in connection with this, or any other, matter.”
Labour MP Joani Reid recently resigned from the party as an internal investigation takes place after her husband was arrested on suspicion of spying for China.
The MP’s husband David Taylor is understood to be among the three men held by Counter Terror police on suspicion of assisting foreign intelligence.
Steve Jones, 68, and dad-of-three Matthew Aplin, 43, were also seized by cops on Wednesday.
They were all released on bail a day later.
