Question: Why does this serial only survive in black and white. If it was made in colour, why did the BBC have black and white copies in the first place?

Doctor Who (1963)
1 question in season 8
Planet of the Spiders - S11-E5
Plot hole: At the climax of episode 2, the Doctor is about to catch Lupton when the latter simply teleports to safety. So why didn't he do that in the first place, before engaging in a 15-minute chase?
The Doctor: You can't rule the world in hiding. You've got to come out on the balcony sometimes and wave a tentacle, if you pardon the expression.
Planet of the Spiders - S11-E5
Trivia: The first thing the Third Doctor does on-screen is collapse out of the TARDIS, which is also the last thing he does in that incarnation.
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Chosen answer: The reason this serial only exsists in black and white when it was recorded in colour is because in the 60's and 70's the BBC wiped and reused video tapes, some of which were Doctor Who. Luckily copies were made and sent to other countries, most of which didnt have colour TV's. These copies were later found and returned to the BBC archive.