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Where an employee is sent to work in another an EU member state, the NIC&EO will normally issue a certificate that contributions remain payable under the UK social security scheme if the overseas assignment is in continuation of his normal UK employment, or, in the case of a new employee hired for the purpose, where he will remain directly employed by the UK employer during the overseas assignment¹. That certificate is now a Form A1 (sometimes referred to as an 'attestation' or 'portable document'), though in cases where the older Regulation still applies the corresponding old Form E101 will have been used and will remain valid until its normal expiry date, for up to 10 years from 2010.

The request for a certificate for a posting (rather than for a multi-state activity) must be made by the employer (or by the individual himself if he is self-employed) to NIC&EO International Caseworker. Application by an employer will normally involve the completion of forms CA3821, CA3822. The appropriate forms for groups of entertainers (eg, theatre companies