In my opinion it is incorrect to describe Polish Information regarding German atrocities as “trustworthy”. The Poles, and to a far greater extent the Jews, tend to exaggerate German atrocities in order to stoke us up. They seem to have succeeded. […] As regards putting Poles to death in gas chambers, I do not believe that there is any evidence that this has been done. There have been many stories to this effect, and we have played them up in P.W.E. rumours without believing that they had any foundation. […] I think that we weaken our case against the Germans by publicly giving credence to atrocity stories for which we have no evidence. These mass executions in gas chambers remind me of the story of employment of human corpses during the last war for the manufacture of fat, which was a grotesque lie and led to the true stories of German enormities being brushed aside as being mere propaganda.
Victor Cavendish-Bentinck (British Ambassador to Poland) in a telegram on 27th August, 1943 (Cavendish-Bentinck was the Chairman of the British Joint Intelligence Committee throughout WWII)