[James2001]

Sixty years of Swing presented by Peter Snow- this went out on BBC Parliament (back when they still made programmes like this) back in 2015 covering past BBC election coverage, was a very good show, a lot of effort put in for something only screened on that channel, talking heads and everything:

www.youtube.com 

Not that the clips from 1970 and 2001 are taken straight from the BBC Parliament screenings, complete with DOGs!

And a similar show, Swing Time, from BBC2 in 1997, this one covers ITN's elections as well:

www.youtube.com 

Can see the poor quality on the 64 and 66 ITN election coverage (there's some clips from ITN's 59 coverage in that show as well, but only in telerecording form)

Also has rehearsal footage for the 1997 election- that took place in February 1996 according to the captions. So the BBC were well prepared in advance and had the set ready that far ahead.

And this clip from another show (on ITV) from 2015 has some of the videotaped footage from 1959 (though cropped to 16:9):

www.youtube.com