Hi John,
Appears that we have two discussions in parallel ?
Not really, we're discussing:
(a) steep descent prior to conducting a normal ILS or similar.
We just have three gradients in reply to the original post:
BOAC: 0.78 NM/1000 ft
JT: 1 NM/1000 ft
HN39: 1.07 NM/1000 ft
Maybe someone can be interested to try it in a simulator?