In the UK, is there a legal procedure for "officially" changing one's signature, or do people just start using a different signature? For example, new UK passports require the bearer to sign the passport. Can the bearer just start using a new signature thenceforth?
EDIT
To clarify, I mean changing the actual letters, not just the style. Changing it from one type of script to another, even. (For example, Chinese to English, or Greek to Russian.)