The Financial Conduct Authority (FCA) said it had issued its largest ever retail banking fine to LBG "for failing to treat their customers fairly when handling Payment Protection Insurance complaints between March 2012 and May 2013", according to a statement.
It comes after Lloyds and other British banks had already been ordered to compensate customers for mis-selling PPI insurance products -- a move that has cost the lenders an estimated 26 billion pounds to date.
"If trust in financial services is going to be restored following the widespread mis-selling of PPI, then customers need to be confident that their complaints will be treated fairly," said Georgina Philippou, FCA acting director of enforcement and market oversight.
Lloyds, which remains 19-per cent owned by the British government following a bailout in the wake of the 2008 financial crisis, apologised to customers affected and said 2.65 pounds million worth of bonuses was being withheld from executives under the settlement agreed with the FCA.
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"Whilst our intentions were right, we made mistakes in our handling of some PPI complaints," LBG chief executive Antonio Horta-Osorio said in a statement issued by the bank.
"I am very sorry for this. We have been working hard with the FCA to ensure all customers receive appropriate redress."
In 2011, British banks lost a high court appeal against tighter regulation of PPI, which provides insurance for consumers should they fail to meet repayments on a credit product such as consumer loans, mortgages or payment cards.
British authorities subsequently banned simultaneous sales of PPI and credit products.