In 1974, where did Led Zeppelin re-shoot several pieces of?

Question

"live" footage to patch into the live sequences of their upcoming film "The Song Remains The Same"?

Answer 1

A stage replica was constructed at Shepperton Studios in August 1974 to re-shoot some close-up shots that were missed last July during filming.

Those with a trained eye will notice it is the Shepperton footage because of Page's shorter hair and Plant's capped teeth.