Ah, the field sport of Pprune: BBC bashing. How about:
Ms Wyatt wanted to mention the Tristar / Air Bridge issue, but they had no Tristars to film. So they framed a shot of a similar transport aircraft such that it looked reasonably generic. It was that or fail to mention the issue at all (you do need some pictures for TV you know, you can't just talk over black).
Have you ever heard of the concept of footage in a library so it's available when needed?
if the BBC haven't got library footage of every type of aircraft in the RAF inventory then they are doubly incompetent.