This artistic work created by the United Kingdom Government is in the public domain. This is because it is one of the following: 1. It is a photograph created by the United Kingdom Government and taken prior to 1 June 1957; or 2. It was commercially published prior to 1963; or 3. It is an artistic work other than a photograph or engraving (e.g. a painting) which was created by the United Kingdom Government prior to 1963. HMSO has declared that the expiry of Crown Copyrights applies worldwide (ref: HMSO Email Reply) More information.