State Immunity Act 1978 (c. 33)

(1) A State is immune from the jurisdiction of the courts of the United Kingdom except as provided in the following provisions of this Part of this Act. (2) A court shall give effect to the immunity conferred by this section even though the State does not appear in the proceedings in question.

(1) A State is not immune as respects proceedings in respect of which it has submitted to the jurisdiction of the courts of the United Kingdom. (2) A State may submit after the dispute giving rise to the proceedings has arisen or by a prior written agreement; but a provision in any agreement that it is to be governed by the law of the United Kingdom is not to be regarded as a submission. (3) A State is deemed to have submitted— (a) if it has instituted the proceedings; or (b) subject to subsections (4) and (5) below, if it has intervened or taken any step in the proceedings. (4) Subsection (3)( b ) above does not apply to intervention or any step taken for the purpose only of— (a) claiming immunity; or (b) asserting an interest in property in circumstances such that the State would have been entitled to immunity if the proceedings had been brought against it. (5) Subsection (3)( b ) above does not apply to any step taken by the State in ignorance of facts entitling it to immunity if those facts could not reasonably have been ascertained and immunity is claimed as soon as reasonably practicable. (6) A submission in respect of any proceedings extends to any appeal but not to any counter-claim unless it arises out of the same legal relationship or facts as the claim. (7) The head of a State’s diplomatic mission in the United Kingdom, or the person for the time being performing his functions, shall be deemed to have authority to submit on behalf of the State in respect of any proceedings; and any person who has entered into a contract on behalf of and with the authority of a State shall be deemed to have authority to submit on its behalf in respect of proceedings arising out of the contract.