Look - a UK citizen steals a car in the UK. The crime is committed in the UK. He gets tried (if at all) in the UK. It doesn't matter a flying fuck who the car owner is or the car owner's residence or nationality.

A UK citizen makes, in the UK, a pirate commercial copy of a CD. Same.

A UK citizen stores an infringing copy of a CD on a website. Harder question. Is it a UK website if the server is in the UK, or if the website is controlled from the UK or if the website host is in the UK? I believe the *right* answer is whre the website is controlled from.

Harder still - a UK citizen organises a website that points others to places where they can access infringing copies. Does he, in law, "authorise" the infringment? If so where does he so authorise - where he is, where the infringing copy is, or where the further infringing copy of the infringing copy may be made? IMHO he authorises where he is, although the UK law has not always agreed with me on this - I think I read the statute correctly and judges have got it wrong.