(Image deleted to avoid breaching electoral law)
Today I got a letter from the Orange Man. It had one of these in it. I ticked the box, and sent it back.
(Hopefully blacking out the barcode and writing "sample" on it is enough to make it clear that I have no intent to forge, counterfeit, or fraudulently deface a ballot. I am proud of my vote, and I'm quite happy to show it to people).