[2] The UKCA marking became part of UK law at the end of the Brexit transition period, on 31 December 2020, with the coming into force of The Product Safety and Metrology etc.

[6][7] The Government planned for UKCA compliance to be a mandatory requirement since then, but the CE mark was accepted as an alternative, initially for the transition period until 1 January 2022.

[8] This deadline for including the UKCA mark was extended to 1 January 2023, then to 31 December 2024, and then on 1 August 2023 the government effectively withdrew the requirement for UKCA, and stated that the CE mark remains acceptable for most goods as a valid sign of conformance.

[6] Initial guidance regarding UKCA marking was originally published by the Government of the United Kingdom in 2019 ahead of a potential no-deal Brexit but was subsequently withdrawn.

[14][b] As part of the British Government's policy of "unfettered access" for "qualifying Northern Ireland goods"[c] to be sold in Great Britain without restriction, goods may be sold in Great Britain using the relevant Northern Ireland markings and without any additional approvals that would be required for the UKCA marking.