You would be well advised to look into the work of Gordon Welchman - during WW II he worked out just how valuable meta data really is. This is why I don't use PGP - that does f-all to protect end points.

Defending against meta data analysis requires looking at the sort of measures that have to be taken in-theather to prevent an enemy from analysing radio traffic for network density and thus identifying leaders and critical end points. Simply at a network level it's already a pain to prevent painting a target on your back.

The next challenge is your friends, because there are no laws against asking them about you - basically the thing that happens continuously on Facebook and LinkedIn.

This is why I laugh when I see yet another company promising that it will "protect you from the NSA" - I know what is needed, and it's a lot more than setting up secure communication. To be honest, these days I'm no longer sure that those asking loudly for crypto backdoors are as clueless as they appear - I'm starting to think that they know very well it's nonsense, but make all that noise to distract you from what they really want, your meta data. In some countries such as the US they have already won, if I'm not mistaken the FBI can now get that data without a warrant.

I'm OK with law enforcement having access to it, my problem is the lack of accountability that is supposed to accompany such powers, because that makes abuse certain. *That* is the real issue someone like Teresa May needs to address. Until then, fingers off.