Strikes me there was no shambles within the scope of the 11 Group response, more a single failure.

Whatever the sequence of events and command/communication between and within the Navy and Bomber Command, within Fighter Command things were generally working ok while Leigh-Mallory was a single point of failure. If his staff were too frightened of his response if they bothered him with an urgent message that was his failing. If only he hadn’t ‘politicked’ his way across from 12 to 11 Group, things might have been different. One of many ‘ifs’, I know. Also one of several apparently inexplicable things about fighter command tactics and strategy 1940-42 that can be traced back to Leigh-Mallory.