However, he admitted that police drones launched to investigate could have caused "some level of confusion".
No he didn't.
Were there actually any in the first place?
Something like 150 sightings were reported, including 4 from people on the airport roof and these 4 were confirmed by 2 police officers close to the runway.
But, don't just take my word for any of the above. Listen to the interview on Raio4's Today programme, 29th Dec on BBS Sounds:
https://www.bbc.co.uk/sounds/play/m0001t04
Interview begins at 1:10:10