Attribution-Share Alike 4.0 truetrue English Location of the United Kingdom within the European Union in 2016. French Position du Royaume-Uni au sein de l'Union
The Bibliothèque nationale de France states the image is public domain, but do not state why. Since there is no signature, and they don't identify an artist
you're trying to prove public domain, you need to use the last person to die, as copyright in the EU is Life+70 years. English determination method: SHA-1