So NFR, when I'm vectoring to the ILS at LHR with traffic at 4,000ft and I say "turn right heading 240 degrees, cleared ILS approach 27R" can you guarantee me that the traffic won't then descend to 2,500ft which is the stated start altitude on the approach plate for a radar vectored ILS/DME approach to 27R.
So, why is the FAP at 2500 ft? Why not make it 4000 ft instead? Like every other state in the world with a similar problem.