Hello,
I too are trying to trace a passenger, Lance Corporal David Fleming, who supposedly sailed on the 'Bahia Castillo' which departed England December 4, 1920 and arrived into Sydney in February 1921.
David, born 1892 in Edinburg, migrated from Scotland to Australia in 1911 with his brothers and parents; in 1916 David enlisted in the A.I.F. and served overseas. Apparently when on leave in the U.K. he married.
According to a letter David's mother wrote to the A.I.F. in 1924, she said he was living in Scotland.
Would appreciate any assistance.