BoB radio frequencies and proceedures

I am trying to find out how the R/T nets worked during the BoB. I know the TR9 and TR1133 overlap in this period so some ac had a single pre set HF frequency and others had a choice of 4(?) VHF channels but did they use an all-inform single freq for 11 group (how confusing would that be?) or was it broken down by sectors or Wg/Sqn/Flt? I found this quote from Johnny Johnson (after BoB I know) that suggests more than one sqn on a net.

"Our radios became almost unintelligible as pilots in our numerous intercepting squadrons called out sightings, attack orders, warnings and frustrated oaths. Somehow, a familiar voice of any one of our pilots would call out and break through the radio chatter with an urgent "Parlor leader, bandits eleven o'clock level."

But that may be frequencies breaking through (HF is weird stuff) or not the norm. Would love to get a grip on how the signals procedures worked. Does anybody have a reference such as 11 Gp SOP or a directive?

Malt