These double doors come in different variations and were used a lot in the colour episodes.
Doors with columns
Episode #75: The Reluctant Revolution
Episode #89: The Art Collectors (twice, with different doors)
Episode #90: To Kill A Saint
Episode #91: The Counterfeit Countess
Episode #92: Simon and Delilah
Episode #95: A Double in Diamonds
Episode #96: The Power Artists
Episode #97: When Spring is Sprung
Episode #100: Invitation to Danger (with different doors)
Doors without columns
Episode #94: The Gadget Lovers
Doors without gold inlays
Episode #99: The Best Laid Schemes
Episode #100: Invitation to Danger
Episode #101: Legacy for the Saint
Episode #104: The Double Take
Doors in a different colour
Just the doorframe
Last updated: 03/24/2018
Episode #108: The Scales of Justice (with some columns on the other side plus Greek doorframe)
Episode #118: The World Beater (exactly the same as in Episode #108 "The Scales of Justice", with Greek doorframe)
Episode #113/114: Vendetta for the Saint
Episode #85: Escape Route
Episode #103: The Organisation Man
Episode #104: The Double Take (with Greek doorframe)
Episode #105: The Time to Die
Episode #108: The Scales of Justice
Episode #115: The Ex-King of Diamonds