(1) A rail operator must not operate a rail vehicle or permit a rail vehicle to be operated on a railway line unless—
(a) the rail operator holds a licence as a rail operator; and
(b) the access provider for that railway line holds a licence as an access provider.
(2) An access provider must not permit a rail vehicle to be operated on a railway line controlled by it unless—
(a) the rail operator of the rail vehicle holds a licence as a rail operator; and
(b) the access provider holds a licence as an access provider.