Most Australian family histories are full of migration stories.
As an auditing exercise, I am listing gateway ancestors,
where they came from and the circumstances of their migration.

James Byrne	1801 (Anne)	Wicklow, Ireland	convict
John Worthington	1806 (Fortune)	Lancashire, England	convict
Catherine Maloney	1806 (Alexander)	England	convict
Sarah Franklin	1812 (Minstrel)	Clare, Ireland	convict
Janet Grant	1837 (William Nichol)	Inverness, Scotland	assisted immigrant
Peter Hunter	about 1840	Durham, England
Alexander McKenzie	1840 (Glen Huntly)	Ross & Cromarty, Scotland	assisted immigrant
John Hall	1841 (Sir Thomas Arbuthnot)	Glasgow, Scotland	assisted immigrant
Roseanna Fitzpatrick	1844 (Sea Queen)	Cavan, Ireland
Anne Reardon	before 1846	England
Elizabeth Getliffe	before 1854	Staffordshire, England
Joseph Webster	before 1855	Derbyshire, England
Fred Kyling	1856 (Johan Caesar)	Lower Saxony, Germany	assisted immigrant
Rachel McCaughey	1858 (Tornado)	Antrim, Northern Ireland	assisted immigrant
Thomas Maher	before 1862	Tipperary, Ireland
Catherine Costigan	before 1862	Laois, Ireland
Caroline Schweinsberg	before 1862	Hessen, Germany
John Noble Pennington	before 1872	Lancashire, England
Harriet Ann Missing	before 1872	Cambridge, England
Patrick Buckley	about 1872	Tipperary, Ireland
James Budd	before 1873	Shropshire, England
Alice Jane Payne	1878 (Glamis)	Worcestershire, England

I compiled this listing as something of an auditing exercise resulting from a Talking Family History information session.

The new Ancestry ethnicity algorithm results came out soon after and the results don’t quite line up with the above ..
46% Scotland (with connections to the communities of Skye, Outer Hebrides and Ross & Cromarty)
40% Ireland
10% England & Northwestern Europe
4% Norway

The previous estimate was:
52% England, Wales & Northwestern Europe
48% Ireland & Scottish