The terminology here is for the UK version. In the U.S, I don't believe Advanced Directives (yes, that's what they're called here) ever expire. If I were a betting man, I'd bet this is specific for the UK branch territory. Can any elder in the U.S. confirm whether this applies here, too?
I was wondering the same thing. But typically privacy laws are stronger in the UK and Europe, so I'd be surprised if there was an instance where U.S. privacy laws prevented the WTS from doing something, but UK/EU law permitted it.