text: of crude oil based fuels to consumers in the United Kingdom or persons carrying on 
  business in the United Kingdom; and 
  
  (b) the activities are required to ensure continued safe operation of the facility, 
  
  where they have travelled to the United Kingdom in the course of their work. 
  
  (2) For the purposes of sub-paragraph (1)— 
  
  (a) a facility has a capacity in excess of 20,000 tonnes at any time if it was used in the 
  previous calendar year for the purposes of downstream oil sector activities in relation to 
  more than that number of tonnes of oil; 
  
  (b) “specified activities” are— 
  
  (i) storing oil, 
  (ii) handling oil, 
  (iii) the carriage of oil by sea or inland water, 
  (iv) conveying oil by pipes, 
  (v) refining or otherwise processing oil. 
  
  **29.**—(1) A worker required to undertake or commence within the period during which they 
  
  would, but for this paragraph, have had to self-isolate in accordance with regulation 9— 
  
  (a) activities on or in relation to an offshore installation; 
  (b) activities on or in relation to upstream petroleum infrastructure; 
  (c) critical safety work on an offshore installation or well being decommissioned or 
  preserved pending demolition or reuse; or 
  
  (d) activities for the provision of workers, goods, materials or equipment or other essential 
  services required to support the safe operation of the activities referred to in paragraphs 
  (a) to (c), 
  
  where they have travelled to the United Kingdom in the course of their work. 
  
  (2) For the purposes of sub-paragraph (1)— 
  
  (a) “offshore installation” has the meaning given in section 44 of the Petroleum Act 1998(**a**); 
  (b) “upstream petroleum infrastructure” has the meaning given in section 9H of the 
  
  Petroleum Act 1998(**b**); 
  
  (c) “well” has the meaning given in section 45A(10) of the Petroleum Act 1998(**c**). 