Red? Are you insane?
Every time the Tardis materializes in a new location, within the first nanosecond
of landing, it analyzes its surroundings, calculates a 12-dimensional data map of everything within a 1000-mile radius, and determines which outer shell would blend in best with the environment.
And then it disguises itself as a police telephone box from 1963.
Itís probably a bit of a fault, actually. Iíve been meaning to check.