Groups I’ve visited:
Unitarians
Christadelphians
Seven-day Adventists
Church of Scotland
Mormons
Brethren (needed truth)
Brethren (mainstream)
Pentecostal (Struthers Memorial)
Grace Communion International (formerly Worldwide Church of God)
Quakers
Methodists
United Reformed Church (local mission)
Free Church of Scotland
Scottish Episcopal Church
Catholic Church
Swedenborgians
Iglesia ni Cristo
Baptists
Non Christian groups:
Brahma Kumaris
Sikh Gurdwara
Hindu Mandir
Krishna Consciousness (Hare Krishnas)
Muslims (Ahmadiyya)
Jewish synagogue
That’s about it. I may have forgotten some.