I found this information before but hadn't posted it as I thought the year of arrival was a bit late from what you had said and Master H seems to be the younger child and Charles - Farm Hand from Middlesex??? If this is your family they should be in the 1901 census.
Mr Chas Spencer, 3rd class, British, Farm Hand
Chas Spencer, 3rd class, British, Farm Hand, with Chas Snr
Master H Spencer, under 18, 3rd class, British
Arrived 27 Dec 1910, London to Adelaide on the Osterley
There may not be any more information than this on the passenger list. One of my family members arrived Adelaide in 1914 and this was about all I got.
Cazay