I have been . . . advised not to post the images, one of which I took possession of at Ewen Smiths office, . . .
You should heed that advice, but it doesn't prevent you from sending a copy to, say, the defence team, or to Roch or ngb1066 . . ., or allowing them access to a copy of it in much the same way that you got access to it in the first place.
and the other which was copied from ACC Simpsons secret file which he kept in his office safe.
That's presumably just an allegation given to you about its source. However, you've never stated you have a copy of the second image, so you're not yet able to do anything with it, right?
