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EXCLUSIVE: The top Cash ISA rate on the market offers returns of 4.4% - but there is one condition savers must meet to get the full rate.

A savings provider has earned an "excellent" rating after boosting the interest on its account to 4.25%. Close Brothers Saving is offering the rate on its five year fixed rate cash ISA.

Analysis from Investec reveals a chasm between the best rates and the worst ones. We look at the deals available, including easy access accounts with 12-month boosts.