T4 is being used for red list arrivals - presumably the aircraft going out to MLE each night is coming in from somewhere on the red list and having to go to T4 first before being towed to T5.
https://www.businesstraveller.com/bu...list-terminal/
London Heathrow airport has reopened its Terminal 4 as a ‘dedicated red list terminal to process arrivals from UK-Government designated ‘red list’ countries. Travellers arriving from these countries are obliged to quarantine. Terminal 4 will act as a separate arrivals facility, keeping direct red list arrivals away from passengers in all other operational terminals.
Last edited by JAXBA; Dec 7, 2021 at 12:07 pm