postcode -> lat/lng is open data already, what this does is postcode -> full address. each postcode in the UK has multiple addresses, but generally a postcode

postcode -> lat/lng is open data already, what this does is postcode -> full address. each postcode in the UK has multiple addresses, but generally a postcode + street number is unique. this data however is held by Royal Mail, and costs a lot of money to license. we believe this is incorrect and are hoping to crowd source the same data for use for free.