HSBC has issued a full-page apology in several newspapers over claims its Swiss private banking branch helped clients evade taxes.
In a letter addressed to customers and staff, chief executive Stuart Gulliver said the revelations over the past week had been a "painful experience".
The fallout from the revelations sparked a political row between the Conservatives and Labour.
The details of 3,600 British residents with Swiss accounts were looked into by HMRC as part of the investigation into the HSBC tax avoidance scandal but only three files were passed on to the CPS, it emerged today.
The revelation came as the head of HMRC faced a grilling from MPs over why tax inspectors haven't investigated more people on the list of HSBC Swiss bank account holders.
ITV News Business Editor Joel Hills reports on the latest developments:
HSBC whistleblower revealing tax avoidance scandal has told ITV News that he was "never" invited to the UK despite contacting HRMC.
Labour have demanded the government makes public what they knew about the HSBC tax-dodging scandal.
The response to the HSBC scandal shows it has become harder for the rich to hide their riches, but it's still possible.