Barclays tops PPI complaints list
The bank also topped the Financial Ombudsman Service (FOS)'s list for the highest number of payment protection insurance complaints, of which 99% were found in consumers' favour.
Barclays, which has set aside £1 billion to cover mis-selling claims, issued figures last week showing PPI fuelled a 67% jump in the total number of complaints in its general insurance and protection business in the second half of 2011.
The bank previously said that excluding the PPI figure, its volume of complaints dropped by 29% in the half-year compared with 2010 and said that tackling complaints was its "top priority".
A huge 99% of PPI complaints involving MBNA Europe Bank and Lloyds TSB Bank were also upheld in favour of consumers, while the rates for Lloyds Banking Group divisions Black Horse and Bank of Scotland were nearly as high at 98%.
There were large disparities between businesses in terms of the percentage of PPI cases upheld however, with only 7% involving the Nationwide Building Society being resolved in consumers' favour.
Natalie Ceeney, chief executive and chief ombudsman, said the huge variation in PPI uphold rates "clearly highlights the difference in PPI complaints handling across major businesses over this period".