There was some discussion recently of making marriage under 18 illegal. Previously it had been a vanishing small number of girls generally to boys of similar age. Not sure which parliamentary group it was.
www.girlsnotbrides.org/child-marriage/united-kingdom/
The United Kingdom has committed to eliminate child, early and forced marriage by 2030 in line withtarget 5.3of the Sustainable Development Goals.
The United Kingdom co-sponsored the following Human Rights Council resolutions: the2013procedural resolution on child, early and forced marriage, the2015resolution on child, early and forced marriage, the2017resolution on recognising the need to address child, early and forced marriage in humanitarian contexts, and the2019resolution on the consequences of child marriage. In 2014, The United Kingdom also signed ajoint statementat the Human Rights Council calling for a resolution on child marriage.
The United Kingdom co-sponsored the2013,2014,2016and2018UN General Assembly resolutions on child, early and forced marriage.
The United Kingdom ratified theConvention on the Rights of the Childin 1991, which sets a minimum age of marriage of 18, and theConvention on the Elimination of All Forms of Discrimination Against Women(CEDAW) in 1986, which obligates states to ensure free and full consent to marriage.
In 2016 the UN Child Rights Committeerecommendedthat the United Kingdom raise the minimum age of marriage to 18 across all devolved administrations, overseas territories and Crown dependencies. It raisedconcernsabout the number of children exposed to harmful practices such as Female Genital Mutilation and Cutting (FGM/C) and forced marriage within parts of the UK and its territories.
In 2019, the CEDAW Committeeexpressedconcerns about the relatively high number of forced marriages in the country, despite efforts made by the Forced Marriage Unit. The Committee recommended the United Kingdom to strengthen efforts to combat forced marriages, including by sensitising parents on the need for free and full consent of their daughters to enter into marriage, and consider alleviating the costs for the repatriation of victims (in cases of child marriage performed overseas).