And it was easier than I thought - a piece of fruit for breakfast, a small lunch (single sandwich, down from two with crisps and chocolate bar on top some days), and a normal evening meal. That would come to around 1500 calories or less a day, easily enough to lose a few pounds a week. It becomes easier as time goes on - your body expects less, I guess. And you do gravitate towards healthier food, simply because you can eat so much more of it.
I've lost two and a half stone since then (I don't follow the diet at weekends so I could have lost more) and am back in the green. Not as much as the article's author - his loss was spectacular!
Alas I did not take a before and after picture, though others have commented, which feels good.
So yeah, great article that I can fully endorse, and encourage others to follow. Just set realistic targets, change will come eventually.