This image is a digitized photograph of Air Vice-Marshal <a href="https://en.wikipedia.org/wiki/Richard_Saul" class="extiw" title="w:Richard Saul">Richard Saul</a>.  The image was taken from <a rel="nofollow" class="external free" href="http://www.rafweb.org/Biographies/Saul.htm">http://www.rafweb.org/Biographies/Saul.htm</a> where it was marked as Crown Copyright.  Saul retired in mid-1944 and so the photograph is more than 50 years old and is therefore now in the public domain.
Unknown author<span style="display: none;">Unknown author</span>
Probably around 1940
<a rel="nofollow" class="external free" href="http://www.rafweb.org/Biographies/Saul.htm">http://www.rafweb.org/Biographies/Saul.htm</a>