The marriage act is clear. Section 25 . Matrimonial causes act 1975
”fair settlement”
the courts can’t even sign off a consent agreement unless rules of fair settlement are met. Not all rules apply to everyone, and it depends on how much money/assets are in marriage. BUT all assets are included; pensions, property, business, chattels, income. No exceptions. Starting point on divorce forms you complete for a financial agreement, is legal requirement to declare all assets. No matter what.
if, and only if, there are enough assets in marriage to meet rules of fair settlement, will a court then potentially agree to couples meeting previous agreements like prenups, loan agreements, inheritance etc.
Consent orders have been turned down by court for not meeting fair settlement- head over to divorce board to see historic examples of this.
sure, fire ahead with loan agreements, and keeping your assets seperately if it makes you happy. But if you think it will protect you against where your spouse is poorer, feckless, abusive or anything else, if your combined assets are limited, from them walking with “your” assets, then dream on. A marriage certificate is a legal arrangement to share your assets with another. That legally stopped you being financially independent from day you married.
there is a reason why Lady Hale, who was involved in modifying this law, calls it the “law of shared misery”.