Hi, I found this info on a website pertaining to same sex couples but this except specifically deals with what we would call common-law relationships.
Cohabiting couples
The main legal rights of mixed-sex cohabitants under Scottish legislation are: �
Recognition as nearest relative (next-of-kin) for the following purposes: �
The right to a say in your partner's treatment if they become incapacitated or are treated under mental health legislation
The right to succeed to the tenancy of the shared home on the death of your partner
The right to claim damages from a person who causes the injury or death of your partner
Legislation to protect from domestic violence
The capacity to foster children jointly as a couple
Hope this helps!