The social security agreement between Switzerland and the United Kingdom entered into force on 1 October 2023. The agreement was signed on 9 September 2021 in order to continue the coordination of the social security systems of the two countries following the UK's withdrawal from the EU, which ended the application of the agreement on the free movement of persons between Switzerland and the EU in relation to Switzerland and the UK. Although the agreement formally enters into force on 1 Octobe…