Arbitrary detaining 50,000 people per year, no right to remain silent, arrest and imprisonment if you refuse an arbitrary search...

Yup sounds like I need to avoid the UK too!

>...the data is considered to have been “legally volunteered” under the Terrorism Act... the person searched “will not be directly told their phone is downloaded.”

Well isn't that a choice bit of doublespeak.

What happens if I ask my friend (in my origin country) to change my password and only reveal the password to me if I'm not under investigation?

A dark trend in a loss of civil liberties -- combined with the all-recording record of electronic devices, this is likely to be an explosively bad combination for those dedicated to human freedom :(