Those factors are the extent to which there has been a change, over the course of the cohabitation, in the economic circumstances of either or both cohabitants and, if there has been such a change, the extent to which the cohabitant has derived economic advantage from the other’s contributions, or has suffered economic disadvantage in the interests of the other or a relevant child (see Report para 5.58, Recommendations 6 and 7(1...