Ah but Shaw it also depends upon whether the stories told can be verified. Now as far as the RAF doing it's bit at Dunkirk that is undoubted and can be verified all the way down the line alpha to omega:

1: Flight records
2: Pilots logs
3: Combat losses
4: Confirmed victories
5: Wreckage of Aircraft (Two Mk 1 Spitfires have been recovered from the beach at Dunkirk and restored. Both are currently airworthy and flying. There are wartime photographs of German soldiers posing with the wreckage - So YES Shaw I believe that they were there and that all those "eye witnesses" were wrong).

Bit different to the story you and your pals tried to peddle. Tales allegedly told by t' "Tommies in t' trenches" of summary executions of British soldiers wasn't it. These summary executions being carried out by their own officers and others by special squads of military policemen. The problems with these stories were:

1: None of these supposed "eye-witnesses" could name one subject of these summary executions.

2: None of these supposed "eye witnesses" could give location, time, or date of any of these summary executions.

3: None of these supposed "eye witnesses" could name any officer who was supposed to carried out any of these summary executions.

4: Items 1, 2, & 3 should not really come as any great surprise because in the entire course of the First World War there is not one single recorded instance of any such summary executions ever having happened.

5: According to the Royal Military Police Museum members of the Corps of Military Police are never used to execute those condemned to death.

So on one hand Shaw we have loads of corroboration and hard evidence that support the fact that the RAF did cover the evacuation of the BEF from Dunkirk - and then on the other there is not one shred of evidence that there was ever any summary executions of any British soldiers by either their officers or by special squads of military police.