I noticed that W3W showed up in a number of places, typically on advertisements, at least around London. Is it used universally across the UK? I don't know of anyone using it in the US aside from a few enthusiasts. I had forgotten about it until a few weeks ago when we were visiting London.
It's far from universal and much less used than postcodes for general purpose location, the company just pushed very hard with UK advertising and did a deal with the ambulance service because "everyone trusts the NHS"
