For your smooth departure from Heathrow, arrive two hrs early and watch flight screens carefully for gate announcements in order to avoid last-minute rushes. Usually not good practical experience with BA. I accustomed to fly BA years in the past all the time, pretty let down by The entire experience, https://firstclassflightstobangkok.blogspot.com/2025/02/5-things-you-must-know-before-boarding.html