O.K to all you whom have been looking at this post, I have an update. I left SYD yesterday on BA16 a 777 in F and had the Resmed Cpap S8 unit with humidifier on the SYD SIN; I did not set it up and only did so on the SIN, LHR. The cabin Crew gave me the power adaptor (not a multipoint as I was informed before I left but the older style cigarette type plug in) I plugged it in toped up the Humidifier and it started to work, about 5 minutes after it started it stopped, and the green light on the plane point went yellow not a good sign, I disconnected the unit and re plugged it in, again start then stop. So as a last resort I plugged it in with the humidifier off, and away it went so it obviously draws too much with the humidifier on, it worked all through the night 8 hr good sleep, I packed it before landing and all was well I did leave the humidifier attached ( not on) and that did help with the Air not being to dry
I am now sitting in one of the Concord room cabanas in T5 waiting for my onward trip to Paris.
I will let you know how it all works from here have a great weekend to all
Wayne