R.A.L.C. -a British munitions factory?

[barkas]

Hello friends,

please, who knows the meaning of the acronym R.A.L.C.?
It should be the manufacturer or supplier of the 5,5" Reconnaissance Flare Mk. I during WW2.
I have found metal ammo boxes for sale on eBay also marked R.A.L.C. with the explanation "Royal Army Logistic Core", but Google doesn't know this marked either.

Thank you, Jan