When the bombers returned to their bases they were "stacked" at 500 feet intervals over the airfield utilizing visual "pundit" lights which were lights flashing the individual airfield code in Morse (We still have one at our GA airfield in Shropshire)
Ive never heard of this stacking over a pundit before could you quote your source of information on this please. I know that SANDRA lights (3 searchlights) were used to pinpoint tbe o/h and their glow could be seen through cloud. One assumes that crews then made some sort of cloud break to get into te circuit from the stack.
27 OTU at Lichfield had a stacking pattern that involved a leg from O/H Tattenhil to Lichfield. In bad weather I wouldnt have thought an ID Pundit light woulkd have been much use for stacking.
It should be rememebered when discussing ATC procedures in WW2 that there was little or no control at the start of the war and that many procedures and aids wre developed as a result of the increased trafic levels, Sandra and Drem being two examples