I have to say, this post made me lol. As noted, the purpose of this rule is not to prohibit your use of Skype in a general sense, it is to prohibit you using Skype as a means of giving information about your characters life that is separate than the world in which s/he lives. So you are free to use Skype however/whenever you so choose, you just are not allowed to be giving any information that would benefit you or anyone else via it. Also about this violating international law, truth is, there is no such thing, freedom of speech is not guaranteed anywhere, just ask Russia or China for example.
Besides, the UK has a number of restrictions on freedoms that you may be unaware of, so I suggest you first read up on what exactly they allow and disallow. Clearly being on a game server that frowns upon your use of a third party tool that could be used to gain an advantage is not covered. Anyways, all that aside, thanks for giving me an easy laugh.