The credit card provider has also tightened its criteria for new customers and is monitoring existing cardholders carefully.

The group said the strategy, which it began last year, aimed to cut the level of bad debt it incurred.

Barclaycard said it was looking at customers on a case by case basis and is using information available to it from other lenders under new industry data-sharing initiatives.

In some cases it said it was leaving people’s credit limits unchanged, but reducing the level of cash advances they could get with their card, as there is evidence to suggest that people who use their credit card to get cash are more likely to be struggling with debt.