Memphis: you claimed that "British courts consistently find that the 'public interest' defence outweighs any right to private property" but the case you mention is incredibly specific and related to providing evidence. I don't think you have proven your claim by a long way.
Simon: You said: "That seems like a claim with no basis. Do you have anything to back it up? Let me guess, mass trespass / right-to-roam ... what else ya got?", are you asking for something like a statement such as:
(1) Every natural or legal person is entitled to the peaceful enjoyment of his possessions. No one shall be deprived of his possessions except in the public interest and subject to the conditions provided for by law and by the general principles of international law.
Thought we were talking about copyright law, but if you're having difficulty accepting the argument, I can't help further than to point you to something like the European Convention on Human Rights. i'd be interested in knowing why you disagree?