Some random thoughts I am mulling over.
Z has kept photos for 25+ years, with a strong inference this is in "self-defence" in case the real story of WHF ever comes to light.
Z offers to show these to Mike Tesko, but with no duplication allowed. However, Mike is allowed to tell us what he has seen.
Z has not given these photos to CCRC or the JB appeal team (we assume).
Therefore, either:-
Z wants to see justice done, but does not trust someone somewhere to use the information correctly; this can be discounted as if the photo gets into the public domain such as publishing on the internet here, it can no longer be denied, or stolen, or lost (etc.)
or
Z is wanting to discredit MT by giving him further info he can speak about but not produce.
or
Z is confused about what course to take. If Z was a police officer, it is difficult to "grass" on an organisation like that, especially where possibly long term colleagues, and maybe Z himself (or herself) may be implicated. Perhaps the thought that it will become clear to others involved that the missing evidence is still around may lead to others coming forward, meaning Z doesn't fear 'outing' this new evidence alone.
Any other ideas on the reasson forr todays revelations?