I'm in the patterned camp with Mindy!
I ended up taking a quilted bed spread to the UK with me as I'm not a huge duvet fan myself. But I also had a queen down duvet from the US that, because it was down, wasn't so thick and puffy as some of the synthetic duvets you can get. It hung more like what you see in your picture above.
I suspect you have 3 choices - explore the quilts and eiderdowns in the UK (also search for oversize bedding), import one from the US, or have something custom made in the UK.