@FH2104 the next doctor is about 90% an original story but the premise of the doctor meeting a human who pretends to be the doctor (the major difference being the guy in “the one doctor” knew he wasn’t the doctor the whole time) was inspired by the big finish. But the stories are completely different (hence why I said inspired by rather than adapted)
It’s by the same thing with Dalek and jubilee, they are completely different stories but with a premise that was inspired by jubilee.