American Express Co. will assess "dormancy" fees on certain cardholders in the United Kingdom who seldom use their cards, a British representative of the company said.

The 20-pound fee ($32.60) will apply to Platinum credit-card holders who fail to spend with their cards over a 12-month period. The fee applies immediately for new cardholders and takes effect Oct. 1 for existing cardholders, payable on the anniversary of the card's issuance, the representative said, declining to say how many Platinum cardholders Amex has in the United Kingdom.

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