As far as I know (willing to be proved wrong) there were never any pots at Chilmark. It was not a charging unit but storage for already charged munitions.
All of the WWI CW factories are listed at TNA in WO 161/1. If you discover the company name in Lancaster I can tell you what was produced there.
Up to 1943 there was an instruction to have 25% of bombs held on bomber airfields to be CW in case of German invasion.