"Fairness has a broad horizon". … 88. The principle which is being applied is that the sharing principle applies with force to matrimonial property and with limited or no force to non-matrimonial property. How should this principle be applied in practice when the existence of non-matrimonial property is being asserted? 89. First, a case management decision will need to be made as whether, and if so what, proportionate factual investigation is required. … 91. Secondly, the court will need to make such factual decisions as the evidence enables it to make. In this context, I do not agree with Mostyn's comment in N v F that a party would need to prove the existence of pre-marital assets "by clear documentary evidence" (paragraph 24). There is no reason to limit the form or scope of the evidence by which the existence of such property can be established. The normal evidential rules apply. These include the court's ability to draw inferences if such are warranted. 92. The court may decide that the non-marital contribution is not sufficiently material or bears insufficient weight to justify a finding that any property is non-matrimonial. 93. Alternatively, if the evidence establishes a clear dividing line between matrimonial and non-matrimonial property, the court will obviously apply that differentiation at the next, discretionary stage. 94. If, however, at the other end of the spectrum, there is a complicated continuum, it would be neither proportionate nor feasible to seek to determine a clear line. C v C was an example of such a case. In those circumstances the court will undertake a broad evidential assessment and leave the specific determination of how the parties' wealth should be divided to the next stage. As I have said, where in the spectrum a case lies depends on the circumstances of the case and is for the judge to decide. 95. The third and final stage of the process is when the court undertakes the section 25 discretionary exercise. Even if the court has made a factual determination as to the extent of the parties' wealth which is matrimonial property and that which is not, the court still has to fit this determination into the exercise of the discretion having regard to all the relevant factors in this case. This is not to suggest that, by application of the sharing principle, the court will share non-matrimonial property but the court has an obligation to determine that its proposed award is a fair outcome having regard to all the relevant section 25 factors. 96. If the court has not been able to make a specific factual demarcation but has come to the conclusion that the parties' wealth includes an element of non-matrimonial property, the court will also have to fit this determination into the section 25 discretionary exercise. The court will have to decide, adopting Wilson LJ's formulation of the broad approach in Jones, what award of such lesser percentage than 50% makes fair allowance for the parties' wealth in part comprising or reflecting the product of non-marital endeavour. In arriving at this determination, the court does not have to apply any particular mathematical or other specific methodology. The court has a discretion as to how to arrive at a fair division and can simply apply a broad assessment of the division which would affect "overall fairness"
‘If the court has not been able to make a specific factual demarcation but has come to the conclusion that the parties' wealth includes an element of non-matrimonial property, the court will also have to fit this determination into the section 25 discretionary exercise.’