Well If you want to get a divorce then you need to fill in a divorce petition form - http://hmctsformfinder.justice.gov.uk/HMCTS/GetForm.do?court_forms_id=1115
to start a divorce.
You must include your:
Include the names and dates of birth of any children (no matter how old they are).
You will have to pay a £410 court fee to start a divorce.
You may be able to get help with court fees if you’re on benefits or a low income.
Send the forms
Once you have filled in the forms: