Yes, we're all going to have to take a leaf from your book, wills, insurance policies even old photos might come in handy if HMRC start questioning whether someone is a collector or is dabbling in trading.

It would be nice to think that HMRC will only go after the businesses blatantly trading on private accounts, but it's quite normal that once a power is taken by authority, it uses it and then goes further with the help of 'mission creep'.  

They may start with the blatantly obvious but as they get more desperate for taxes , their sights will inevitably be set lower and the questioning more ruthless.