The Three Degrees at The Royal Albert Hall was a 1979 television special produced by the BBC. It was a live concert performance by the American female vocal trio The Three Degrees, who were backed by the London Philharmonic Orchestra at London's prestigious Royal Albert Hall on 8 October 1979. This was The Three Degrees' second television special.

Can we draw the following conclusion?
The Three Degrees television special produced by the BBC was the most viewed television special in 1979.
It's impossible to say