Ancestry.co.uk have launched a UK incoming passenger list database for 1878 to 1960. This is series BT 26 from TNA.
Indexed and linked to colour scans of the origins, the records may include name of passenger, their birth date or age, port of departure, port of arrival, date of arrival and vessel name.
The passenger lists are for people arriving in the United Kingdom from ports outside of Europe and the Mediterranean. You can expect to find expats returning to visit family and friends, tourists, immigrants to the UK and business travellers.
Searching is free but there is a charge for viewing the full entry and downloading images of the passenger lists.
A quick check found many people I have researched over the years and I anticipate spending considerable time with this database over the next few days.