II do need to change a few halogen bulbs for LEDs in the room our son now uses. We didn't bother previously as the room wasn't really used. Otherwise we've LED in rest of house.
Install the Hugo Energy app too. It's broadly similar, but there are a couple of small differences - it feels a bit nicer to use generally. I'll be keeping both.
Since we've become energy-obsessed over the last week or so, the one major change we've made is to our living room lighting. As previously explained the three wall lights, each with two bulbs, were inherited with the house and I've never given them a thought until now.
Six halogen bulbs at 42w each means they were costing a small fortune to run and I had no idea. We're now largely not using them, and just turn on a single standard lamp with an energy efficient bulb. That alone will save us hundreds of pounds over the course of the year.
Many rooms in this house have numerous recessed ceiling lights. My son's bedroom has seven. Until recently some of these were halogen, but are now all LED. However, when he's in there gaming, he doesn't need his room lit up by all seven lights, so we're going to get him a lamp instead. As we lose daylight and lights are on more and more, this will also save a bit, once we've trained him anyway!