text: **16.**—(1) Any person who the relevant Department has certified as meeting the description in 
  
  sub-paragraph (a), (b) or (c)— 
  
  (a) a Crown servant or government contractor who is required to undertake essential policing 
  or essential government work in the United Kingdom within the period during which they 
  would, but for this paragraph, have had to self-isolate in accordance with regulation 9; 
  (b) a person returning from conducting essential state business outside of the United 
  
  Kingdom; 
  
  (c) a person returning to the United Kingdom where this is necessary to facilitate the 
  functioning of a diplomatic mission or consular post of Her Majesty or of a military or 
  other official posting on behalf of Her Majesty. 
  
  (2) For the purposes of sub-paragraph (1)— 
  
  (a) “consular post” means any consulate-general, consulate, vice-consulate or consular 
  
  agency; 
  
  (b) “Crown servant” has the meaning given in section 12(1)(a) to (e) of the Official Secrets 
  Act 1989(**a**); 
  
  (c) “essential government work” means work which has been designated as such by the 
  relevant Department, and includes, in particular, work related to national security, the 
  work of the National Crime Agency in pursuance of its statutory functions, and work 
  related to immigration, the coronavirus disease or any other crisis response, but does not 
  include work of the description in paragraph 2 of this Schedule (essential work related to 
  the United Kingdom border); 
  
  (d) “essential policing” means policing which has been designated as such on behalf of the 
  
  relevant chief officer or chief constable; 
  
  (e) “essential state business” means activity which has been designated as essential to the 
  United Kingdom or Her Majesty’s Government by the relevant Department, and includes, 
  in particular, bilateral or multilateral discussions with another state or international 
  organisation and visits to another state on behalf of the United Kingdom or Her Majesty’s 
  Government; 
  
  (f) “government contractor” has the meaning given in section 12(2) of the Official Secrets 
  
  Act 1989. 