You can find an Ombudsman by searching on this website. 

How to use an ombudsman (in England) to investigate a complaint about maladministration in public and private sector organisations.

How to use an ombudsman (in Wales) to investigate a complaint about maladministration in public and private sector organisations.

The Adjudicator’s Office deals with complaints about agencies such as HM Revenue and Customs. So if, for example, you are unhappy with how HM Revenue and Customs dealt with your complaint about their handling of your claim for child benefit or tax credits, you can complain to The Adjudicator’s Office.

Things don't always go right and as with any other service, you may need to make a complaint about your bank or building society. Explains how to make a complaint to your bank or building society and what you can do if you are not satisfied with their answer.

All housing associations and local authorities (councils) must be a member of the Housing Ombudsman Scheme. Some private landlords are voluntary members. Explains how to make a formal complaint to your landlord and how to get help from the Ombudsman. (Content applies to England only.)

The Local Government and Social Care Ombudsman can look at complaints about most council services, including those covering: housing, planning, education, transport and highways, environmental health, neighbour nuisance and anti-social behaviour, and all adult social care providers. They can consider complaints about things that have gone wrong in the way a service has been given or the way a decision has been made, if this has caused problems for you.

Ombudsman Services provides independent dispute resolution for the communications, energy, property and copyright licensing sectors.

Ombudsman Services: Communications resolves complaints about companies which provide communications services, including phone and broadband to the public.

The Office of the Independent Adjudicator deals with individual complaints against universities and colleges in England and Wales.

How to complain about government departments, their agencies and some other public bodies in the UK (and the NHS in England) if they have not acted properly or fairly or have provided a poor service.

The Prisons and Probation Ombudsman (PPO) investigates complaints made by prisoners, young people in detention, offenders under probation supervision and immigration detainees and the deaths of prisoners, young people in detention, and immigration detainees due to any cause, including any apparent suicides and natural causes.

The Office of the Immigration Services Commissioner (OISC) can accept complaints about any person giving immigration advice. Explains who and what you can complain about, how to complain and what happens after you've made a complaint.

The Furniture Ombudsman is the independent standards body for furniture and floorcoverings and is not allied to any retailer or manufacturer. Supporters of the Furniture Ombudsman subscribe to the Code of Practice for the furniture industry, which is underpinned by an independent dispute resolution service.

The Removals Industry Ombudsman Scheme resolves complaints about removal or storage companies that are members of the National Guild of Removers and Storers.