WWII British Ammunition Filling Factories

[MarcdeB]

I have no idea whether this has been asked before but I am looking for information on abbreviations for WWII British ammunition and filling factories.

I've learned that Sc/C is a Canadian ammunition factory and Pg/C a Canadian filling factory.
But I have also seen abbreviations KBY, TH and SM/C. I assume the latter is also Canadian but have no idea what all these stand for and what other British factory abbreviations existed.

Any help would be much appreciated.

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[Snufkin]

/C denotes Canadian. So Sc/C is Scarboro Canada Filling Factory, Ontario; Sm/C Stormont Chemicals Ltd, Ontario; Pg Pickering Canada Filling Factory, Ontario.

KBY is Kirkby Filling Factory, Liverpool; and TH is Thorp Arch Filling Factory, Yorkshire.