Membership in the credit union is voluntary and is open to all citizens bound by with joint work or residence, who wished to create a credit union to use its services and are willing to take on relevant commitments and responsibilities. Typically, donor contributions to the credit unions are targeted and used in the same statutory requirements and restrictions as the Mutual Financial Aid fund as a whole. Today in the UK there are about 700 credit unions with assets exceeding 200 million pounds. When organizing the credit union it is important that people know each other and know the extent to which each of them is trustworthy. International cooperation has been particularly felt since the days when Alphonse Desjardins began the activity on development of credit union movement in North America. Contributions from of shareholders in credit unions in no way can be considered as borrowed funds, they come from the shareholders and for the shareholders and can not be used to provide services to third parties. In the UK, credit unions are a source of financing of people groups. This tool is not widely used. Credit unions are financial institutions, financial cooperatives of citizens, and in this capacity they are above all associations of people, not unification of capitals, which is typical, for example, for public companies. To increase the number of credit unions in 1979 was adopted the corresponding law that serves as the legal basis of their activity.