Hi, thank you for your question. The information you have received from the CAB is incorrect. As you are married, and it appears the home is the matrimonial home, she has matrimonial home rights even though the property is in your sole name. These rights entitle her to occupy the home at least until divorce, and also to seek a claim for a share of it.
Without a court order (such as an occupation order) excluding her from the property you will not be legally allowed to change the locks.
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You can apply for it using form FL401 to your local family court, however there are strict tests that the court will need to assess (called the balance of harm) before granting such an order as it would render her homeless. The court will consider:
a) the housing needs and housing resources of each of the parties and of any relevant child; (b) the financial resources of each of the parties; (c) the likely effect of any order, or of any decision by the court not to exercise its powers under subsection (3), on the health, safety or well-being of the parties and of any relevant child; and (d) the conduct of the parties in relation to each other and otherwise.
If you feel you are in immediate risk or danger you can contact the police first, and if they do not assist then you can urgently (on the day and without notice to her) attend court to apply for the occupation order and a non-molestation order (an injunction) which can be done on the same form. You should accompany it with a detailed statement outlining the history, the most recent incidents and the most serious incidents.