https://www.humanreligions.info/tags/unification_church.html
Main page:
Human Truth Foundation pages (3):
A List of Christian Denominations and Sects: 3.21. Unification Church (1954CE)
Christianity: 4. Denominations
Religion in the United Kingdom: Diversity, Trends and Decline: 4. Census Results for 2011, and Comparison to 2001