@Brahumbug
Pretty much
Explainer from the Guardian
"Civil partnerships were created in 2004 as a means of allowing same sex couples to enter into a union that guarantees them similar legal rights to those who are married.
Until recently they have been limited to same-sex couples. In October 2018, following a supreme court ruling declaring the existing position discriminatory, the government announced that heterosexual couples would also be entitled to enter the arrangement.
There are differences between the two forms of union, partially symbolic and partially matters of substance. For a marriage, the ceremony is solemnised by the couple saying a prescribed form of words; in a civil partnership, the couple can simply sign a document.
Marriages can be conducted through either a civil or religious ceremony, at a registry office, church or wherever a venue is licensed. Civil partnerships are secular events, although partners can choose to hold a religious ceremony on the day.
Civil partners cannot declare, for legal purposes, that they are married. Civil partnership certificates include the names of both parents of the parties whereas marriage certificates in England and Wales include only the names of a couple's fathers – for the time being.
In terms of annulment the rules are virtually identical, although the clause that permits a marriage to be dissolved if one partner is 'suffering from a venereal disease in a communicable form' does not apply to civil partnerships.
Likewise, adultery can be grounds for a married couple to divorce though it cannot be relied upon to end a civil partnership.
Those in civil partnerships and those who are married enjoy the same tax breaks and benefits – such as the marriage allowance and bereavement payments.
Surviving civil partners are treated the same as widows or widowers in terms of rights to state pension.
While those who are married and in civil partnerships enjoy extensive legal rights, those who are merely cohabiting – 3.3 million couples at the last estimate – have no legal protections or property rights if one of them dies."