"Fireless Locomotives" (Baker & Civil, 1976) gives livery details of some locos that were delivered to two Admiralty Munitions factories in 1914/15/16.
CROMBIE No. 1 - blue, with white lining
CROMBIE No. 2 - blue, picked black edged white
CROMBIE No. 3 - blue, picked black edged white
BEDENHAM No. 2 - green
BEDENHAM No. 3 - green, picked black edged white
So looks like livery of Admiralty establishments differed between sites.