Here is my guide for Painting World War I British uniforms and vehicles using Humbrol enamels. I have also done a painting guide for the World War I (WWI) German uniforms and vehicles.
British Infantry
Humbrol No. 26 Khaki (jacket)
Humbrol No. 26 Khaki (trousers)
Humbrol No. 61 Flesh (hands faces)
Humbrol No. 83 Ochre (water bottle)
Humbrol No. 160 German Camouflage Red Brown (weapons)
Humbrol No. 33 Black (machine guns)
Humbrol No. 55 Bronze (machine guns)
Humbrol No. 11 Silver (bayonets)
British Artillery
Humbrol Colours
Humbrol No. 86 Light Olive (artillery)
British Cavalry
Humbrol Colours
Humbrol No. 26 Khaki (jacket)
Humbrol No. 26 Khaki (trousers)
Humbrol No. 61 Flesh (hands faces)
Humbrol No. 83 Ochre (water bottle)
Humbrol No. 160 German Camouflage Red Brown (weapons)
Humbrol No. 11 Silver (bayonets)
My World War I Book Library