Right answer to the question I didn’t ask.......and the tax isn’t voluntary. Once the figure becomes significant they take it seriously too.
Like I said, best not to brag about it if that’s what you do.
Here’s a hypothetical question: suppose a keen watch fan buys a hard to find Rolex watch overseas, forgets to declare it at Customs, then realises he’d prefer to sell the watch to a dealer and make a few bob. Where does the dealer (and next owner) stand regarding the unpaid tax? With current watch prices the amount of money unpaid is well over a grand, not a couple of hundred like it was in the past.
If a dealer’s offered a new unworn watch sourced outside the EU is he under obligation to ask for proof the there’s no outstanding tax/duty payment?