The same way as it exists for two people who got married and no longer want to be married. If the government provided clear and easy to follow rules for divorce, the pots and pans legal sector would disappear over night. This bill has nearly 40 pages of "procedure".
The more you read the more you realise it's loopy. Sec 12 for example. That could easily run to £10k in costs. if judges opt to routinely hold detailed hearings, then there are advocacy costs on top not to mention one thing being missing and one objection and the judge must reject the application.