I’m currently at Heathrow Terminal 3 (Saturday, March 22). Feel free to ask me anything about potential disruptions! In short, things are running mostly smoothly, with only a few minor delays.
I’m at Heathrow Terminal 3 now (Sat 22 March) AMA if you want information about any disruption

Thanks for the update! Are there any specific airlines or flights experiencing delays, or is it pretty consistent across the board? Also, how is the security line wait time looking?