Today I am calculating distances between UK postcodes so if someone says they live in the SW1A 0AA postcode and they want to find information within 3000 meters of that postcode, I’m doing the math for that.
Did you know that the UK postcode system is copyrighted? That means there are very few tools available for this so the wheel has to be constantly reinvented. http://www.freethepostcode.org/ is trying to help. Copyrights are not always a good thing.