In 1977 the group was joined by New Zealanders Bill Logan and Adaire Hannah, who had led the Spartacist League of Australia and New Zealand from 1972 to 1977, and who were "transferred to London at the behest of the Spartacist international leadership" with a view to strengthening the tendency's organisation there. "The Spartacist League/Britain was founded in 1978 as a fusion between the London Spartacist Group and the Trotskyist Faction (TF), which split from Alan Thornett's Workers Socialist League ...".
In 1977, the group welcomed New Zealanders Bill Logan and Adaire Hannah who were previously leaders of the Spartacist League of Australia and New Zealand. They were brought to London by the international Spartacist leadership to strengthen the organization in Britain. The Spartacist League/Britain was formed in 1978 as a merger between the London Spartacist Group and the Trotskyist Faction (TF), which had split from Alan Thornett's Workers Socialist League.