But, again, while inappropriate, distasteful and worse, nothing actually illegal...
You might even argue - from the pov of News International - that as Lewis and Harris had 'public profiles' (whatever that may be) it was legitimate and potentially in the public interest to explore their personal lives; any future legislation on privacy will have to include a public interest defence, and that defence might legitimise actions such as this. It would only become illegal if News International tried to manipulate, blackmail, etc.
We have to note, News International didn't publish anything about these two, and didn't approach these two.
Privacy/public interest is a friggin minefield, for sure.
And fwiw, this Committee is a self-aggrandising, amateur fucking circus, they should shut up and let the Public inquiry do its job.