[en] The paper is the United Kingdom Nuclear Data (UKND) progress report, and summarises nuclear data research in the UK between January and December 1986. The contents of the report contains nuclear data work presented by:- UKAEA Harwell, UKAEA Winfrith, National Physical Laboratory, and the Universities of Birmingham, Edinburgh and Oxford. Included in these contributions are collaborative studies involving institutions in Holland, Italy, West Germany and the United States. The report also contains contributions on Chemical Nuclear Data, as well as the summaries of three invited lectures presented at the 19th UK Nuclear Data Form, Harwell Laboratory, 1986. (U.K.)