BBC 1988 "The Lion, The Witch And The Wardrobe”. All 6 episodes one after another. Episodes:-
Ep.1 – 0:00:00
Ep.2 – 0:29:28
Ep.3 – 0:58:32
Ep.4 – 1:27:31
Ep.5 – 1:55:19
Ep.6 – 2:24:29

The HD rip from the (standard definition) DVD and episodes merge were done together in one step to preserve quality. Ripping in HD, even from a Standard Definition DVD, means that when it is uploaded to YouTube, YT automatically allocates better audio to it.
By the way, it’s surprising, but all these 6 episodes on a single BBC DVD – can be bought from some sellers on Amazon for as little as 1p plus postage!