Misc photo seeking info on who, when & where?

The back of the photo is stamped by a photography company in Syndey, Australia. Writing notes names from left to right as ‘ R.K Fourness, K. C Soelm, R. Cross (C/ma NSW Section SDC Australia NZ), A. McLean (SDC Aust & NZ)’. Some writing slightly difficult to read so the names may be slightly different. Do you have any information?