There are different forms of export licences:
**Standard Individual Export Licence (SIEL).** This is for the export of specific controlled goods to a specific customer. This licence is generally valid for two years and is used for permanent exports. If the goods are to be exported temporarily, a temporary version of the SIEL would be used but that would only be valid for a year and the goods must be returned before the expiry of the licence.
**Open General Export Licence (OGEL).** You would apply for one of these if you had to export specified controlled goods on a regular basis (ie more than a handful of times). They remove the need to apply for SIELs, but they can be revoked if abused!