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The first same-sex marriages in England and Wales took place following the passage of the Marriage (Same Sex Couples) Act 2013.

Same-sex marriage in the United Kingdom

Same-sex marriage is legal in all parts of the United Kingdom. As marriage is a devolved legislative matter, different parts of the United Kingdom legalised at different times; it has been recognised and performed in England and Wales since March 2014, in Scotland since December…
Source: Wikipedia (CC BY-SA)

Marriage (Same Sex Couples) Act 2013

United Kingdom legislation

The Marriage Act 2013 is an Act of the Parliament of the United Kingdom which introduced same-sex marriage in England and Wales.
Source: Wikipedia (CC BY-SA)