Assuming this is a corporate rather than a personal booking, in all seriousness why don't you consider VS UC? The HKG-LHR route on the A340-600 is excellent and except maybe for rows 16 and 17 (a bit too close to the galley and the bar) there are no bad seats and it's very very quiet due to no trolley service and lightweight HK-based crew not stamping up and down the aisles!! You can even preallocate on non-full price fare classes. Unfortunately this route does get sold out weeks in advance on Friday and Sunday nights but you might be lucky.