Er Northolt doesn't have an ILS on both runways.
Nobody has said they did. Just that they do have an ILS.
Heathrow controllers can put Northolt traffic on the ILS.
It's semantics, but does that not then mean as part of the Heathrow licence they are licenced for Northolt too?
Similarly, London Control can put traffic on the Heathrow or Gatwick ILSs. It doesn't mean they have to have anything written in their licences.
I need to re-read my MATS 2. I thought area controllers could only vector towards the ILS but couldn't give the instruction to intercept without explicit co-ordination with the approach controller. Usually only given in rare circumstances.
But I get your point. I once cleared an aircraft to land at Blackpool (through co-ordination!) because it was having radio problems and couldn't switch frequencies. And I don't have a tower licence.