It appears that no flights are arriving or leaving this morning after activists from Black Lives Matter in the UK locked themselves together on the runway.
Inbound flights appear to have been diverted to Southend or Gatwick airports.
Check before you leave for the airport as I suspect this is going to be messy even once the protestors have left. Looks like most flights until 4pm are cancelled.
The BBC is reporting 7 people have been arrested following the protest – link here.