text: **17.**—(1) A person returning from undertaking essential or emergency work outside of the 
  United Kingdom, which has been certified by the relevant Department as necessary to facilitate 
  essential government work or essential state business. 
  
  (2) For the purposes of sub-paragraph (1) “essential government work” and “essential state 
  
  business” have the same meaning as in paragraph 16. 
  
  **18.**A person designated by the relevant Minister under section 5(3) of the Repatriation of 
  
  Prisoners Act 1984(**b**). 
  
  **19.**A person responsible for escorting a person sought for extradition pursuant to a warrant 
  issued under Part 3 of the Extradition Act 2003(**c**) or sought for extradition pursuant to any other 
  extradition arrangements. 
  
  **20.**A representative of any territory travelling to the United Kingdom in order to take into 
  custody a person whose surrender has been ordered pursuant to any provision of the Extradition 
  Act 2003. 