I’m considering hiring MyLondonPainter for some interior work in my flat — mainly living room and hallway. I’ve seen great reviews about their attention to detail, but I'm curious about the quality of the materials and paints they use.
Do they go with high-end brands? Or do I need to request upgrades separately?

You can start by getting accurate painting estimates to understand the full scope of the work. Ask MyLondonPainter about the materials and paints they use. They may offer high-end options, but it’s best to confirm.