Sorry, cassa>, I had not read your question and the earlier answers properly.
I believe that no offence would have been committed by Dick and Harry in your example. People cannot be prevented by law from looking at things, even if the possession of those things may be illegal.
Imagine, for example, that somebody had posted an offensive photograph on a lamppost. Passers by may well look at it, but cannot be charged with any offence. The fact that such a viewing may take place in a private place cannot, in my view, create an offence.
Nothing in either of the two Acts I quoted says anything about viewing, only �owning�, �making�, �publishing� and �advertising�.