article_snippet: The Building Societies Association said there was not ‘one single factor’ driving down Isa rates but said the ‘persistently low base rate’ had contributed to lower returns.
article_snippet: A spokesman added: ‘I don’t think there is a hard correlation between Isa rates and mortgage rates.
article_snippet: The Building Societies Association said there was not ‘one single factor’ driving down Isa rates but said the ‘persistently low base rate’ had contributed to lower returns .