Geography

Postar produces audience estimates for advertising campaigns that take place in Great Britain. JNOR, the equivalent organisation in the Republic of Ireland, is presently researching Northern Ireland.

For the purpose of our work we divide Great Britain into a series of contiguous areas.

Audience data is reported using the Incorporated Society of British Advertisers (ISBA) definitions of non overlapping television areas. Advertising panels are located in the government's defined town and district boundaries.