Living together and civil partnership – legal differences …

A civil partnership is a legal relationship which can be registered by two people who aren’t related to each other. Civil partnerships are available to both same-sex couples and opposite-sex couples. Registering a civil partnership will give your relationship legal recognition. This will give you added legal rights, as well as responsibilities.

https://www.citizensadvice.org.uk/family/living-together-marriage-and-civil-partnership/living-together-and-civil-partnership-legal-differences/