I was wary of breaking something, which was why I asked.
I got the footrest off today. That video was a great help. I am surprised that such an involved step isn't mentioned in the Haynes manual.
When I got it off, I found that the little tab that was mentioned in the video was broken off. I couldn't find it anywhere, so I'm guessing that a previous expeditioner broke it.
No matter. Now I can put the mount for the accelerator pedal under the carpet. Much neater and a bit stronger.
Peter.