28 February 2011
Last updated at 03:59 ET
Complaints to the ombudsman about financial services rose by 15% in the second half of 2010 compared with the first half of the year.
Lloyds Banking Group topped the complaints list, the ombudsman said, although it is the UK’s largest bank.
The figures, which cover complaints about banks, insurance and investment firms, showed the ombudsman service had received 97,237 new queries.
This list only covered those complaints which required mediation.
Banks are also publishing data about all their complaints, and this covers customer gripes which were dealt with before any case went to the ombudsman.