Section 3 of the Transport Act 2000 (c. 38) makes it an offence for a person to provide air traffic services in respect of a managed area without an authorisation to do so by virtue of either an exemption granted under section 4 or a licence granted under section 5. See section 40(3) for the definition of “managed areas” and section 98 setting out the general interpretation of “air traffic services”.
Link: The Air Traffic Services (Exemption) Order 2019
Source: Legislation .gov.uk