In 1979 the nationalists were in disarray when a referendum was defeated, and further efforts came to nought during Conservative rule in the British Parliament at Westminster through the 1980s and early 1990s.
There are no records of the defeat of any referendums in British Parliament the 19th century. 
mnli hypothesis: There are no records of the defeat of any referendums in British Parliament the 19th century.  premise: In 1979 the nationalists were in disarray when a referendum was defeated, and further efforts came to nought during Conservative rule in the British Parliament at Westminster through the 1980s and early 1990s.