Households may not receive bank statements or other bills in the new year, as postal workers are threatening not to deliver letters sent via private firms.
Lloyds Banking Group is writing to millions of customers this week to explain how their banking arrangements will change as it prepares to sell over 600 branches to the Co-op.
HSBC has become the latest giant to set aside extra cash to pay victims of mis-sold payment protection insurance, once again highlighting the huge scale of the scandal.
Taxpayer-backed Royal Bank of Scotland has set aside another £400 million to compensate customers it flogged worthless payment protection insurance to.