A version of this image is also to be found in Boyle's biography Trenchard Man of Vision (plate facing p. 320). It is credited to the Hulton Picture Library but as neither the Hulton Picture Library (founded 1945) nor its parent publication, the Picture Post (founded 1938), existed at the time of the Independent Air Force Dinner, they cannot be the original copyright holder. As the work is a photograph with an unknown author taken more than 70 years ago, copyright expires 70 years after creation.
This UK artistic or literary work, of which the author is unknown and cannot be ascertained by reasonable enquiry, is in the public domain because it is one of the following:
A photograph, which has never previously been made available to the public (e.g. by publication or display at an exhibition) and which was taken more than 70 years ago (before 1 January 1954); or
A photograph, which was made available to the public (e.g. by publication or display at an exhibition) more than 70 years ago (before 1 January 1954); or
An artistic work other than a photograph (e.g. a painting), or a literary work, which was made available to the public (e.g. by publication or display at an exhibition) more than 70 years ago (before 1 January 1954).
This tag can be used only when the author cannot be ascertained by reasonable enquiry. If you wish to rely on it, please specify in the image description the research you have carried out to find who the author was. The above is all subject to any overriding publication right which may exist. In practice, publication right will often override the first of the bullet points listed.
Unpublished anonymous paintings remain in copyright until at least 1 January 2040. This tag does not apply to engravings or musical works. More information
{{Information |Description={{en|1=The Independent Air Force Dinner on 14 July 1919 at the Savoy Hotel, London. Left to right are: HRH Prince Albert, Major-General Sir [[w:Hugh Trenchard, 1st Viscount Trenchard|Hugh T