If you are being vectored for an ILS approach to any airfield, surely, at some stage, you must be CLEARED to do it! Otherwise it makes a complete nonsense of having the approach in the first place.
At one of Europe's busiest airports, Schipol, when often 3 runways are in concurrent use, you are descended to an altitude, given a closing heading, and CLEARED FOR THE ILS RW??. Less RT, less hassle, never a problem. Why do we make things so different in UK?