This appears to be the last trip you quoted.
Charles J C Leach. Born about 1879 London. England and aged 50 years.
Port of Departure: Southampton, England to New York on the Berengaria, arriving 12 December 1929. Charles is single. Occupation:-Valet
Aunt Mrs Nellie Evans. 7 Madras Place. London. Destined to Manhasset. NY
States he has been in the USA 1927- 1929
Employer R G Elbert. Manhasset. Long Island. NY. Intended to stay permanently.
Was this your Charles James Curtis Leach
Born 17 Sep 1879 in Islington, Middlesex, England ??
Ancestry tree has Charles married September 1936 - Surrey S W - 2 a 1488
Looking that up, the lady appears to be Elsie M A Colman.
The UK Death Index shows:- Charles J C Leach. Born about 1879 and died Q4 1952 Brighton. Sussex. - Ref Volume 5 h Page 43. Died age 73 years.
Sandra