Hey, From what I have experienced, the Air China Sales Office in London was very organized and provided a lot of assistance. When I went to the office to ask about rescheduling my ticket, the staff kindly assisted me with the procedure. They provided a clear explanation of fare differences and available options. The office was easy to find and not overly populated. My overall experience with the Air China Sales Office in London contributed to a smoother and more stress-free travel planning process.