Struth, why not clear all the confusion by dropping the word 'runway' completely from the instruction and substituting the number eg "after takeoff heading 180" or "after takeoff track 190"? When giving a heading one assumes ATC know the runway QDM and roughly what the wind is likely to do to the aeroplane as regards any terrain or traffic separation. When they don't, the track option is presumably the better. It may not be ICAO-speak, but since when did Australia worry about that?