Here's an idea ...
how about we give them exactly what they want.
I musty have Petabytes stashed on various defunct HDDs - so they can start with that.
Plus all those useless 256Mb USB keys you got given at conferences, or on training courses.
Then they can have all of my DVD backups - going back to 2002.
Plus a drawerful of not-used-for-years mobile phones (most of which the PIN code has long been forgotten on).
That's before we get to anything paper.
I reckon my house alone would take them a few thousand man hours to find the square root of fuck al. Longer if they want to play RIPA-blink and see if a court thinks not remembering a 10 year PIN is good enough reason to not comply.
If a few thousand people did that, it might stop them once and for all. Especially if the accompanying news reportage noted that if there was anything of value in the freely surrendered data and THEY MISSED IT with an atrocity ensuing ....