# The British Citizenship (Designated Service) Order 2006, Paragraph 2


(1) Service in pursuance of an appointment outside the United Kingdom in respect of which the person concerned is on secondment from Crown service under the government of the United Kingdom or of a qualifying territory.
(2) For this purpose, a person is on secondment from Crown service under the government of the United Kingdom or of a qualifying territory if, having been serving in such Crown service, he is for the time being in temporary service under arrangements whereby he is to return to such Crown service when that temporary service ends.

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Source: https://www.legislation.gov.uk/uksi/2006/1390/schedule/2/paragraph/2 (the official version)
Page: https://openlegislation.uk/british-citizenship-designated-service-order-2006/schedule-2/paragraph-2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.