The U.K. Outward Passenger Lists on Ancestry sometimes show how a passenger leaving the U.K. arrived there. I’ve found this information for someone who left from Libau and then took a ship from Southampton to Canada.
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Alan Shuchat
Newton, MA
SHUKHAT (Talnoe, Simferopol, Sevastopol, Odessa, Balta (Abazovka), Pogrebishche)
VINOKUR (Talnoe), KURIS (Mogilev-Podolskiy, Ataki, Berdichev)
ZILBERMAN (Soroki, Kremenets), BIRNBAUM (Kamenets-Podolskiy)
KITAIGORODSKI (Zvenigorodka)