International Brigade Memorial Trust,
"They arrived back in Victoria Station on the evening of the 7 December 1938 where they were met by a huge crowd to welcome them back home, including amongst others, a number of senior members of the British labour movement, including Clement Attlee, the leader of the Labour Party.

For many of the veterans of the International Brigades, the struggle against fascism would continue. Many (where they were accepted) fought in the Second World War and many joined the International Brigade Association, which continued to press for a return to democracy in Spain."
http://www.international-brigades.org.uk/content/returning-home