Yup, not only does it work, but it works well. I did have to cut the factory harness (well, splice it) for the steering wheel controls. But actually, I now realize I wouldn't have had to and my original plan would have worked...I was missing an (optional, but actually mandatory) ground pin on the harness.

Regular (US, not sure about UK) staples turn out to the same size as the smaller pins in that connector, and you can wedge them in to add additional pins (9/10) for the steering wheel. I had missed the ground pin off so it wasn't reliable and wound up splicing in a "it's late, and I'm cold" moment.

Jon.