http://www.awm.gov.au/collection/records/awm8/1/42/awm8-1-42-1-0005.pdf

lists Guillaux with the rank of ‘airman’ and also an ‘attendant’ as accompanying  HQ 1 Australian Division which embarked on HMAT Orvieto from Melbourne in 22 October 1914.(October 1914)

A05282

The official caption reads:

BLERIOT TYPE XI-2 AIRCRAFT. TRANSLATION OF INSCRIPTION: TO MR WATT, VERY CORDIALLY. M GUILLAUX., HELIOPOLIS AIRFIELD, 9 MARCH 1914. (COL. O WATT COLLECTION) [CAIRO, EGYPT. CLOSE-UP COCKPIT WITH PILOT. [M. Guillaux]