Lee Young wrote:If you own the property as joint tenants this can only be 50/50
No, this implies that each owns 50%. If you own property as joint tenants this means that each own the whole (notwithstanding that for IHT and CGT purposes you may be regarded as owning 50% each).
hammerz wrote:75/25% contribution
You'd be looking to show that there is a constructive trust. What evidence is there to support this? What about indirect contributions (i.e. were you able to contribute 75% because she perhaps met other expenses that you would otherwise have had to pay?)