All the above seem to digress from the original point and also concentrate on the rather parochial UK practices.
Goosensheep...does this clarify?
ICAO PANS-ATM
8.9.4 Vectoring to pilot-interpreted final approach aid
8.9.4.1 An aircraft vectored to intercept a pilot-interpreted final approach aid shall be instructed to report when established on the final approach track. Clearance for the approach should be issued prior to when the aircraft reports established, unless circumstances preclude the issuance of the clearance at such time. Vectoring will normally terminate at the time the aircraft leaves the last assigned heading to intercept the final approach track.
2 s