Married Persons Property Act 1986

If a person who is married or in a civil union or civil partnership makes a payment or allowance to his or her spouse, civil union partner or civil partner to pay their joint household expenses or for similar purposes, any property bought with the payment or allowance and any money not spent from the payment or allowance shall, in the absence of any agreement to the contrary between the person and his or her spouse, civil union partner or civil partner, be taken to belong to the person and his or her spouse, civil union partner or civil partner as joint tenants.