There were many RN warships that never received camouflage paint. Most of the Grand Fleet spent the war in a uniform coat of grey. One of the reasons for thia was that camouflage could deceive an observer regarding the course and speed of the ship. For a fleet of ships maneuvering together this could lead to collisions.
Battleships and battlecruisers
Cruisers and Destroyers
Wetherhorn 