For any smooth departure from Heathrow, get there two hours early and check flight screens carefully for gate bulletins to avoid past-moment rushes. This was so stupid ! The bag was modest. So I had to place my things in my pockets, place the funny bag inside the other bag. https://premiumeconomyflightslondon.blogspot.com/2025/02/5-tips-to-book-best-business-class.html