Ordnance Survey

Ordnance Survey is Great Britain’s national mapping agency. It carries out the official surveying of GB, providing the most accurate and up-to-date geographic data, relied on by government, business and individuals. Ordnance Survey is an executive agency of the Department for Business, Innovation & Skills

OS is an executive agency of the Department for Business, Innovation & Skills

http://www.ordnancesurvey.co.uk/