St John Ambulance

St John Ambulance's logo appeared faintly and clearly on/off on the First Doctor's TARDIS. (TV: An Unearthly Child-The Tenth Planet/Twice Upon a Time) It was not present on the Second Doctor's TARDIS, (TV: The Power of the Daleks-The War Games) however it returned on the Third Doctor's TARDIS very briefly as he arrived on Earth (TV: Spearhead from Space) but afterwards disappeared again for multiple incarnations (TV: Spearhead from Space-The Eleventh Hour) until it re-appeared on the Eleventh Doctor's TARDIS and remained on the Twelfth Doctor's TARDIS. (TV: The Eleventh Hour-Twice Upon a Time) The sticker was absent from the Thirteenth Doctor's TARDIS. (TV: The Ghost Monument onwards)