You are quite right that EGCC is Manchester. And that AD 2-EGCC-4-1 would logically refer to the Aerodrome specific entry of Manchester.
In fact, one of the places I listed in my post is within that entry - EGCC AD 2.22 FLIGHT PROCEDURES - 7 SPECIAL LOW LEVEL ROUTE. That entry refers to "The Low Level Route is illustrated at AD 2-EGCC-4-1."
My question arises because the AD 2-EGCC does not have anything called 4-1 in it...
Each entry is numbered 2.1, 2.2 and so on.
Unless the version at
Eurocontrol is incomplete...
B.