Unlike in lots of other countries, there's technically no such thing as a "sworn translator" in britain or america. A sworn translation in the provision is necessary by the UK of an affidavit, where linguists themselves must visit a solicitor and swear an oath that they are certified and that the translation is definitely honest and accurate professionally.

In the case of converting that country’s language to the spanish requires a translator’s expertise. Please be aware that UK certified, notarised or sworn translations of recognized documents will be acceptable to Uk authorities and a true number of authories abroad, including the USA. However, some employers, government organizations or authorities accept translations from the country in which the documents originated, or from a sworn translator of their own country.