The British law states that an individual's work is placed under copyright law as soon as it leaves that person's mind and is placed in some physical form, be it a painting, a musical work written in manuscript or an architectural schematic.
Of course there are many exceptions like when you are an employee and create something for your company etc. but the need to register it first was abolished a long time ago (i think in 1956).
Of course it's better to register your work because you can much easier prove that is your work if you have to go to court, but it's not necessary.
You automatically have the copyright on your "work" (painted skin or whatever).
btw patents, trademarks and copyrights are three completely diverse things.