MR LAX
If I may?  I understood your earlier evidence to be that this happened a long time ago and that your memory was such that you couldn't remember this person clearly enough to be able to identify him from the photographs, that was the tenor of your testimony previously.  You're now saying something subtly different to that.  You're saying that the image you have in your head is different to these photographs and that's a positive failure to identify, that's a positive statement, saying the person you remember is different to this person.  What you said previously in your testimony was that this happened a long time ago and you can't remember whether this person in these pictures is the same as that person.