Originally Posted by
Kiwi Flyer
It is a door that is not signposted. I don't recommend using this - if caught you could be thrown out of the lounge or worse. The F side is normally closely monitored by staff, and with relatively few passengers, they'll have no problem spotting an interloper.
This is true, and I would not reccomend it if you're not willing to shoulder the risk. Although I think playing stupid would probably get you thrown back into the business side. Maybe thrown out of the lounge, but I doubt about anything worse.
The first class side also has a lovely toilet room with a Japanese toilet