TSB has been relaunched as a standalone bank - 18 years after disappearing when it merged with Lloyds.
TSB has now become Britain's eighth biggest high street bank with 4.5 million customers and over £20 billion of loans and customer deposits transferred from Lloyds Banking Group.
The bank, which was famous for its slogan "the bank that likes to say yes", has returned to its original logo of white lettering on blue circles.
TSB's chief executive Paul Pester said it "bucks the trend in banking", adding:
We’ve gone back to the future by bringing back local banking to UK high streets supported by 21st Century technology.
We have today launched a bank which has been born fully formed - with over 600 branches, four and a half million customers and over 8,500 staff - TSB is most definitely open for business.
The bank's mission statement harks back to the founding of the Trustee Savings Bank movement more than 200 years ago when the Reverend Henry Duncan created a "bank for hard-working local people".
TSB wrote on its Twitter account:
After two years in the making, I'm delighted to be bringing back local banking to the high streets of Great Britain. #HelloTSB ^PDP
Join in our excitement and say hello to someone today using #HelloTSB
The bank will have offices in Birmingham, Gloucester, Edinburgh, London and Bristol, with call centres in Swansea, Sunderland, Edinburgh and Gloucester.
Here are some classic TSB adverts from before its merger with Lloyds: