The most common reason for preparing a pre-nup or pre-cip is where you are jointly purchasing a property but only one person is funding the deposit. The document can then be used to set out what will happen to that deposit if you later divorce.
Pre-nups or pre-cips are particularly beneficial if you have been married before or met later in life, having accumulated assets in your own right. They are also sensible to consider if a person has children from a previous relationship, to ensure that their assets are protected and preserved for the future, rather than their new spouse or civil partner going forward.
Or perhaps a family business is involved – here, a pre-nup or pre-cip can ensure that control of the business remains within the family in the event of a later separation between the couple.