Does anyone have a go-to shop for high-quality wall art in the UK? I’m looking for something specific like a world map or a nature scene for my hallway, but I want it to fit the wall perfectly. Any suggestions?

You should definitely look at https://muralas.co.uk/ Their catalog is massive, covering everything from nature to maps and abstract art. Everything is made-to-measure, so you get a perfect fit every time. You can even upload your own high-res photos if you want a completely unique look. Plus, they usually have 40% off sales, which is a great bonus.