On 24 december, reached agreement in principle of Brexit is published in the website of the european commission.
The link includes, among other documents:
Below provides spanish guides that specify step-by-step process to the mark UKCA [PDF] [251 KB] and UKNI [PDF] [270 KB].
It also attached links to web pages of the united kingdom government where you can find guides of label use UKCA and put in the market of products:
Further in the Site of the united kingdom you can find the webinarios (in english) where will explain the use of the brand UKCA and requirements of placing on the market of products in The United Kingdom and northern ireland.
Thanks for your comments.