There are 3 links in the first Flying Lawyer post.
(1) Concorde
This was a link to the video of Concorde leaving JFK.
It now appears to be permanently disabled.
(2) LHR
This is a link to the BBC coverage of a different Concorde landing at LHR.
It is still working.
(3) End of an Era
This is an alternative link to the video of Concorde leaving JFK.
ie the same video as (1) above.
It still works, except (I assume) when the server is overloaded.
I checked it a few minutes ago and it was working.
Heliport