When preparing your documents for your visa application from outside the UK. It is good practice to be well aware of the UK's document requirements.
For some visa's you may be required to meet the English Language requirement.
English Language Requirements
You must prove you can read, write, speak and understand English to at least level B1 on the Common European Framework of Reference for Languages (CEFR) scale.
You can prove your knowledge of English by:
passing a Secure English Language Test (SELT) from an approved provider
having a GCSE, A level, Scottish National Qualification level 4 or 5, Scottish Higher or Advanced Higher in English, gained through study at a UK school that you began when you were under 18
having a degree-level academic qualification that was taught in English - if you studied abroad, you’ll need to apply through Ecctis (formerly UK NARIC) for confirmation that your qualification is equivalent to a UK bachelor’s degree, master’s degree or PhD
Who does not need to prove their knowledge of English
You do not need to prove your knowledge of English if you’re a national of one of the following countries:
Antigua and Barbuda
Australia
the Bahamas
Barbados
Belize
Canada
Dominica
Grenada
Guyana
Jamaica
Malta
New Zealand
St Kitts and Nevis
St Lucia
St Vincent and the Grenadines
Trinidad and Tobago
USA
Document Translation
All documents which are submitted as part of the application, should be in english. If any document is not in english then to validate the application, they would be required to be translated into english alongside a certified verification a true copy of the original by getting it signed and dated by a professional person, like a solicitor.
When you apply for something like a bank account or mortgage, you may be asked to provide documents that are certified as true copies of the original.