Regarding texts within the area of research, they usually come from companies and persons who collaborate with the Modern Language Service.
Equally, the Linguistic Support Unit is also tasked with resolving language and terminology queries, and can advise on any subject related to language, such as drafting and writing documents, dictionaries and specialised works, etc.
You can order revisions and translations at this link. You will also be able to see the fees, the conditions for presenting original texts and timeframes.