“UK ETS Order” means the Greenhouse Gas Emissions Trading Scheme Order 2020( a );  “Verification of report” means an independent, systematic and sufficiently documented  evaluation process of an Emissions Report;  “Verification body” means a person that performs the verification of an Emissions Report as  an accredited independent third party;  “Verification team” means a group of verifiers, or a single verifier that also qualifies as a team  leader, belonging to a verification body conducting the verification of an Emissions Report,  whether or not supported by technical experts; and  “Verification report” means a document, drafted by the verification body, containing the  verification statement set out in paragraphs 3(22) to (26) of Schedule 6 and required  supporting information.  5.  In this Order, a person is an “aeroplane operator” where that person is an operator that  produces annual CO$_{2}$ emissions greater than 10,000 tonnes from the use of an aeroplane with a  maximum certificated take-off mass greater than 5,700 kg conducting international flights.  6.  The non-SI units listed in column 2 of the Table must be used either in lieu of, or in addition  to, SI units( b ) as primary units of measurement under this Order.  Table  Non-SI units for use with SI units  PART 2  Administration  CHAPTER 1  General  Units  Meaning of aeroplane operator  Notification to ICAO of voluntary participation in CORSIA  7. —(1) The Secretary of State must notify ICAO of any change in the decision by the  government of the United Kingdom to voluntarily participate, or to discontinue its voluntary  participation, in CORSIA, for the purpose of the inclusion of the United Kingdom in the ICAO  document entitled “CORSIA States for Chapter 3 State Pairs”( c ).  (2) The notification in paragraph (1) must be made by 30th June in each year from and including  2021 to and including 2025, for the purposes of inclusion in the subsequent year of the scheme.  ( a ) S.I. 2020/1265.  ( b ) The International System of Units (SI), commonly known as the metric system, is the international standard for  measurement.  ( c )  “CORSIA States for Chapter 3 State Pairs” is available from the ICAO website at www.icao.int. For a hard copy contact the  ICAO E-Commerce and Publications Sales Unit at International Civil Aviation Organisation (ICAO), 999 Robert-Bourassa  Boulevard, Montreal, Quebec H3C 5H7, Canada (telephone +1 514-954-8219 and e-mail sales@icao.int).  8 Specific quantity  Non-SI Unit  Symbol  Definition (in terms of SI units)  Mass  tonne  T  1 t = 10$^{3}$ kg  Time  hour  H  1 h = 60 min = 3,600 s  Volume  litre  L  1 L = 1 dm$^{3}$ = 10$^{-3}$ m$^{3}$ 