artfulrobot
commented
6 months ago @ehk20 yes that's a brilliant resource. I use that in a number of projects.
It does, of course, add an external, 3rd party, networked dependency which is slower than a local DB, so there's a use-case for each possible solution.
(A would-be implementer should note that it has special methods for bulk lookups.)
This is a free resource that provides an API which would greatly simplify the UK Postcode method: https://postcodes.io/docs and not require a local database table.