U.K. Prime Minister Gordon Brown pressed officials from banks and credit card lenders Tuesday to curtail borrowing costs after a report showed that rates charged to customers rose even as the central bank reduced them.

A study of 240 credit cards by the research group Defaqto Media Ltd. showed that the average interest rate had climbed 0.4 percentage point from May to November. Some lenders, including NatWest, a unit of Royal Bank of Scotland Group PLC, increased their card rate to 16.9%, from 13.9%.

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