The Financial Conduct Authority (FCA) is likely to prefer to use its formal, statutory information gathering powers to require the production of documents and information, but there are certain situations where informal requests for documents and information are more effective, or necessary, for the overall integrity of an investigation. This Practice Note introduces the scenarios where an informal, voluntary approach tends to be used and the ways in which the FCA is able to request information from firms and individuals on a voluntary basis. This includes the voluntary provision of witness statements and internal investigation reports, as well as voluntary attendance at interview by suspects and non-suspects.