Click on the postcode tab if you want to search the postcode database.
Type the postcode you are looking for in the postcode field. Remember to delimit the two part of a postcode with a space - e.g. TN13 1WY. You do not have to fill in the postcode in its entirety. To find all postcodes in TN13, just type in TN13 and click the Find button.
You can use the other search fields also. To find all postcodes in Sevenoaks type Sevenoaks in the Post Town field. Notice that as you type the nearest match is automatically found. So for Sevenoaks it is only necessary to type 'Sev'.