I have distant, but very happy, memories of watching The Avengers in black and white in the 1980s. Was it early evening on BBC Two? More likely Channel 4.
Memories of John Steed (played by Patrick Nacnee) wandering around psychedelically-decorated sets (you can do a lot with spinning black and white!) which looked like giant board games, with his bowler hat and dangerous umbrella , accompanied by the leather-clad Cathy Gale (Honor Blackman) or Emma Peel (Diana Rigg). Taking orders from “Mother”, and driving classic cars.