The Group were based at La Senia,Algeria but moved around Tunis as well. Perhaps they were on a mapping/shopping mission to Egypt or may have been a meeting at high level (Operation Torch ?)
It was probably Elliott meeting his father in Cairo. http://www.info.dfat.gov.au/info/historical/HistDocs.nsf/vVolume/834A9F0BC9913EAFCA256B7E001E3F3B