Hasn't it already been said Channel had no quad equipment? So they would have been restricted to film.
It's been said loads of times yes !! The only VT
facilities they had in 1979, were low band U Matic for news use, any programming on tape would have been supplied on 2 Inch Quad format. (B and C Format 1 inch had only just launched in 76, very few broadcasters were using it in anger, and in any case way out of financial reach at that time for Channel)