Post by Roger HayterIndeed, various coordinate systems have been developed over several centuries.
And we do have commercially available databases of all property addresses
with either latitude and longitude or GPS coordinate data to within metres.
The trouble is that the meaner courier firms, let alone ordinary visitors, do
not subscribe to them.
Theoretically, UPRNs (Unique property Reference Numbers) could fill that
gap. Datasets mapping UPRNs to coordinates are freely available under the
Open Government Licence[1], so there is no cost to an organisation which
wants to use them to locate a delivery point. And, although the datasets
which link postal addresses to UPRNS in bulk are not free, the data is
publicly available for anyone to look up their own UPRN[2].
So, if you know that your UPRN is, say, 100030490201, you could give that
number to a supplier and that's all they need to know to plug into a sat-nav
and get to the street in front of your house. And another advantage of UPRNs
is that, unlike postcodes and postal addresses, they also apply to
non-addressable objects. So you could, for example, get a delivery to
10010457355 or 10022990231. Or even 10023242987, which is about as on point
as you can get[3].
UPRNs are already widely used in local and national government - they're
particularly useful in planning, because there are often planning
applications for things that don't have postal addresses (eg, electricity
substations, or farm buildings) and therefore can't be uniquely identified
by an address.
However, UPRNs aren't particularly consumer friendly. They're designed as
unique identifiers in databases, and work very well for that. But they're
not memorable, and they're not structured - just because your UPRN is
100080025423 doesn't mean that your neighbours are 100080025424 and
100080025422. They might be, but they might not be. And you can't tell from
a UPRN where in the country it is, without doing the actual lookup. With a
postcode, you know that all the addresses in ST4 6NU are going to be
reasonably close to each other, and that they in turn are going to be in the
same neck of the woods as properties in ST4 6xx, which is a subset of ST4,
and so on. UPRNs have no such structure.
They're also pure numbers, allocated sequentially, without anything like a
check digit. So if you give your UPRN to a supplier, but get just one digit
of it wrong, somewhere (and they're up to 12 digits long, so there are penty
of opportunities for a typo), and your parcel will end up in completely the
wrong place, quite possibly the other end of the country, and there will be
no clue from the faulty UPRN what the real one might be.
[1] https://www.ordnancesurvey.co.uk/products/os-open-uprn
[2] FindMyAddress: https://www.findmyaddress.co.uk
[3] You can also use FindMyAddress to look up those UPRNs if you want, but
it's rate limited and you'll quickly run out of searches if you do several.
For a simple UPRN to coordinates lookup and map display, use https://uprn.uk
which is unlimited.
Mark