Postcode of the property. Only the first part of the postcode (the Outcode) is essential but the full postcode should be provided wherever possible. eg You could enter 'TW99' but 'TW99 1ZZ' would be better.

Coverage for the service is the United Kingdom together with the Channel Isles and Isle of Man.

If the postcode is not known, try using one of the internet postcode finders such as http://postcode.royalmail.com.