For once, I believe that the Beeb deserves some credit.
Filmed two years ago, no-one expected that the film's 'conclusion' (that one of the old boys featured was the last to visit the Western Front) would turn out to be wrong. I understand that when it became clear that plans were afoot for another visit by a WWI veteran to France on Armistice Day itself it was felt that coverage of that event should not be pre-dated by this documentary. There was, in other words, a desire not to steal Henry Allingham's richly deserved thunder as he (and another of the veterans) went across this year.
At 109!
And he was a former member of the Royal Air Force.