The Supreme Court has now ruled in the 2010 case of Kernott v Jones, in which the respective shares of a property bought by a couple who cohabited and then split had to be decided. The published decision can be found at: http://www.bailii.org/uk/cases/UKSC/2011/53.html (http://www NULL.bailii NULL.org/uk/cases/UKSC/2011/53 NULL.html).
The Court of Appeal had previously awarded Mr Kernott 50% of the value of the house in which he had lived with Ms Jones. The Supreme Court has now overturned that decision and instead awarded him only 10%. The reduced award means that the amount that he will recover from the sale of the property will be dwarfed by his legal costs.