Hi Turnbull, I can assure you that Ken Hom's method is exactly how the chinese restaurant would do their egg fried rice. As long as your rice is cooked the day before or even cooked in the morning, forked to loosen and leave to cool uncovered (assuming you do the fried rice in the evening for dinner), then shouldn't be a problem. And that's how I do my fried rice never failed.
Because I'm from Malaysia, I tend to use soya sauce both light and dark to give it the Malaysian Chinese style and with chilies of course as I like it hot. The dark soya sauce I use is the Indonesian Kicap Manis, gives it a hint of sweetness.
Whatever you choose to add to your fried rice, just make sure that your wok/frying pan is very hot. After adding the eggs, leave it for a few seconds for the wok to gain some heat then turn the rice and let it sits a few seconds for the heat to dry and heat through the rice in order to cook the rice, do that until the eggs are cooked (you will see bits of cooked eggs stuck to the rice), then carry on turning until the rice are all separated and serve immediately with any anything you like.