The Marriage Act (Scotland) 1977 and the Marriage Order (Northern Ireland) 2003 both state there is a legal impediment to marriage if the parties are of the same sex.

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The petition was run at Manchester Pride and Reading Pride in 2009, and launched online in January 2010 In an interview in July 2010 Lib Dem deputy party leader Simon Hughes confirmed that the coalition Government plans to open marriage to same-sex couples, saying, "It would be appropriate in Britain in 2010, 2011, for there to be the ability for civil marriage for straight people and gay people equally... Scottish Liberal Democrats: At their 2010 spring conference a motion was passed calling on the Scottish Government to allow same-sex couples to marry, describing the exclusion of same-sex couples from marriage as a "discrimination that needs to end".

Green Party: On , the Green Party called for an end to the ban on civil marriages between same-sex couples in Britain and in other EU member states.

The President of the Family Division, Sir Mark Potter, gave as his reason that "abiding single sex relationships are in no way inferior, nor does English Law suggest that they are by according them recognition under the name of civil partnership", and that marriage was an "age-old institution" which, he suggested, was by "longstanding definition and acceptance" a relationship between a man and a woman.

He agreed with the couple's claim that they were being discriminated against by the Civil Partnership Act 2004, but considered that "To the extent that by reason of that distinction it discriminates against same-sex partners, such discrimination has a legitimate aim, is reasonable and proportionate, and falls within the margin of appreciation accorded to Convention States." They said that "denying our marriage does nothing to protect heterosexual marriage, it simply upholds discrimination and inequality" and also said that the ruling insulted LGBT people and treats their relationships as inferior to heterosexual ones; not worthy of marriage but only of an "expressly different, and entirely separate institution." Gay rights campaigner Peter Tatchell said that the establishment's aggressive opposition to same-sex marriage and the successful demand of £25,000 from the couple damaged the Government's "gay-friendly credentials".

Of the fourteen British Overseas Territories, same-sex marriage has been legal in Akrotiri and Dhekelia and the British Indian Ocean Territory (for UK military personnel) since 3 June 2014, the Pitcairn Islands since , the British Antarctic Territory since 13 October 2016, Gibraltar since 15 December 2016, and on Ascension Island since 1 January 2017.

Of the three Crown dependencies, same-sex marriage has been legal in the Isle of Man since 22 July 2016 and will soon be legal in Guernsey (awaits commencement).

Talbot in 1967, the prohibition was held to extend where one spouse was a post-operative transsexual, with Mr Justice Ormerod stating "Marriage is a relationship which depends on sex, not on gender".

Prohibition of same-sex marriages was also included in the marriage legislation of Scotland and Northern Ireland.

He also claimed that the demand in legal costs was designed to damage the couple financially so they would not be able to appeal.