The extend discretionary leave to remain in the U.K. is a visa type for all the non residents of the European states. Basically, the extend discretionary leave to remain in the U.K.allows a person already living in the U.K. to get his or her family or civil partners to the U.K.
In this particular extend discretionary leave to remain in the U.K. visa type the person can get his or her spouse to the boundaries of the U.K.