Could be of note: I arrived to Gatwick Wednesday evening at 18:30 – 2.5 hours before the drones closed the airport. What was peculiar was the presence of heavily armed police just before immigration. They had all incoming foot traffic form into one line and walk past a (presumably) drug-sniffing dog. I don't recall seeing this before at Gatwick or Heathrow. Why would you sniff for drugs before baggage claim?