w3w has been sold to most UK emergency services to deal with that exact scenario. I know Richmond Park well, and it's hard to direct anybody to anywhere in it u

w3w has been sold to most UK emergency services to deal with that exact scenario. I know Richmond Park well, and it's hard to direct anybody to anywhere in it using addresses, so it makes sense. The problem is that w3w is privately owned and has multiple issues with it, as well documented elsewhere. They could invest in a solution that allows for an OS grid reference to be discovered by sending you a link (a bit like they do with w3w), or some other open (already paid for) reference. That still has limitations if you don't have a smart phone with GPS on it, but I'd argue it's better than what they have right now. Of course none of this solves for the fact the most useful location dataset in the country is the PAF, and we can't use that without spending a small fortune on licensing it.