your weekly friendly reminder that refusing to hand off passwords to authorities is a crime in the UK, punishable with up to 2 years in prison (5 if the case is marked as sensitive for "national security"). That's a pretty nice wrench.
> (9) A notice under this section shall not require the disclosure of any key which-
> (a) is intended to be used for the purpose only of generating electronic signatures; and
> (b) has not in fact been used for any other purpose.
I'm not versed in bitcoin enough to judge if wallet data protected by that password is used only for signing. This clause seems largely meant to avoid the possibility that authorities will impersonate a user after forcing him to hand over his key.