The procedure is an independent visual approach (IVA);
The pilot has been assigned a visual approach, has confirmed that the runway is in sight and been given a 30 degree or less intercept of final;
So why is everyone on this thread referring to the localiser?
No clearance for an ILS approach has been issued because the ILS is an instrument approach with tolerances that can take the aircraft through final; (In some circumstances the pilot may have been previously assigned tracking via the localiser, however once the visual approach is commenced the pilot is expected to track the centerline visually)
AIP Page ENR 1.1-61 starting at paragraph 7.4.2 (Available on the Airservices web site) explains all.