Since April last year, regulator the Financial Conduct Authority has required banks to inform them of any major operational or security incident which prevents customers from using payment services.
Which? found the average number of major breaches across each of the 30 banks and building societies in its analysis was one a month – with six of the major banks suffering at least one every two weeks.
Barclays reported most major incidents (41), at more than one every week in the last nine months of 2018. It was followed by Lloyds Bank (37), Halifax/Bank of Scotland (31), Natwest (26), RBS (21) and Ulster Bank (18).
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