There are lots of ways to make the case for a fairer voting system for electing MPs, but I think I may have come up with the most novel. I was in the staff kitchen at work the other day when colleagues starting chatting about the referendum, triggered by a newspaper article about it. They were split between the YES camp and the NO camp, both drawing on what seemed like standard arguments deployed by both campaigns.

I started trying to win over the antis, but wasn’t really getting anywhere. Then a thought occurred to me. I was peckish at the time, about to head out to buy something for a very late lunch. It was the sort of time in the afternoon when the range of sandwiches at the nearby Pret A Manger starts to dwindle – maybe they’ll have run out of smoked salmon, BLT, chicken avocado or whatever else.

“I’ll buy everyone here a sandwich from Pret. You can choose what you want using either first-past-the-post, or the alternative vote. If you choose first-past-the-post then you get one choice and if it’s run out then you get nothing. If you use the alternative vote then you can, of course, let me know what you want ideally, but if they’ve run out of it you can let me know what you want as a second and third choice.”

You’ll be unsurprised to learn that they all decided to use the alternative vote, and I think this little exercise won over the sceptics too.

Of course if you meet someone who wants a less sandwich-based explanation of how the alternative vote works, I can heartily recommend this video that Jonathan Wallace shot of me setting out the case for change and explaining how the alternative vote works. Take a look: