Today in the UK there are about 700 credit unions with assets exceeding 200 million pounds. Specialization of credit unions to provide financial services to its shareholders requires a particularly strict regulation of membership and acceptable activities. The difference between credit unions and banks is clearly is apparent when comparing the structure of assets and liabilities of credit unions and banks. Credit unions perform the function of social protection in a vital for people sphere of financial services. They care about improving the financial literacy of the population, are working on the formation of their members and their employees. Cooperation between credit unions, how they would not have been named, took place always, from the moment when the movement moved outside one credit union. Income derived from the provision of services to its members, does not become the profit of credit union and is distributed among its members in proportion to their savings. In the credit union compensation for use of the loan (interest) is a source of compensation for savings. The relationship between credit unions and shareholders arise from the membership and are not customer relationship. Credit unions historically formed as a special form of social support, initially taken upon themselves the social mission of protecting the interests of citizens in the field of financial services.