Grounds for divorce in UK There are 5 grounds on which you can apply for a divorce, 1. Adultery: Adultery can be defined as a voluntary sexual intercourse between a married person and someone other than his/her lawful spouse. 2. Desertion Desertion can be defined as a willful abandonment of a spouse without any consent hence breaching the legal obligations. 3. Unreasonable Behaviour If a spouse has behaved unreasonably, this can be presented as a ground for divorce in the court of law. However the spouse has to prove that the other spouse has behaved unreasonably and it’s impossible to live with him/her.