St John Ambulance

The logo of the St John Ambulance appeared on some police boxes.

The Doctor's TARDIS
The logo appeared variably on the First Doctor's TARDIS. It was either non-existent, (TV: Twice Upon a Time etc.) very faint, (TV: The Aztecs, The Ark etc.) or in perfect condition. (TV: The Space Museum, The Chase etc.)

It was not present on the Second Doctor's TARDIS for the most part (TV: The Power of the Daleks - The War Games) but was still seen occasionally such as during his travels with John and Gillian. (COMIC: Master of Spiders, Egyptian Escapade)

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)