No, these are volunteer weather stations, not the "official" ones. It looks to me like a person has to register with the Met Office WOW site to get their weather on the WOW site. The Met Office, like all the other big agencies, would get all the national weather observations. When I was in the Yukon Weather Centre we got weather observations from all over the world, but only "official" weather, not the kind of reports that Weather Underground gets. The weather underground stations, I suspect, are from people with little weather stations that are hooked up to their computers. You can see, though, from the map that there are lots of them.