If everything is in his name, you have to establish your interest in the property through an area of law called trusts law.
The specific type of trust is called a constructive trust - where you gain an interest in the property through contributing towards it.
This is normally limited to angle contributions that improve the property itself, such as renovation, home improvements, decorating.
Furnishings and white goods don't increase the value really, they would be the subject of a dispute as to ownership. So for example, if you bought all of the items in the house to use jointly, then you should walk away with half of the items. They are jointly owned, and you are entitled to half of them.
That's a dispute about belongings though, not a share in the value of the property, which was the first point.
So there's two routes - one for a share in the property value and the other to share jointly owned belongings.
You should probably see a local solicitor and work up a proposal to put to him.
I hope that clarifies things for you?