The seller is Dennis Alter, the former CEO of credit card company Advanta Corp.

WSJ: Private Properties: Santa Monica Compound Lists for $18.8 Million

Meanwhile, some Money Box listeners who have held an RBS Advanta card, which has been converted into the new Mint brand, are also angry.

BBC: NEWS | Programmes | Moneybox | Double Mint offer exposed

Money Box found that most of Barclaycard's big rivals, including RBS Advanta, Lloyds, MBNA and Capital One, are not actively telling people to contact them before they travel abroad.

BBC: Hotline combats card mix-ups