I recall that someone at the college I was attending had come up with some innovation that was going to be demonstrated on TW, and so we all dutifully watched. Something to do with reducing the noise when playing back vinyl records, I think. Unfortunately it was still very early in its development, and didn't perform too well on the night. I think it was affected by all the electrical noise in the studio.
At the time, the BBC were (and still are) very arts orientated. Long and turgid programmes about obscure artists and musicians that nobody had ever heard of, still less cared about. Ernest programmes like Kenneth Clark's Civilisation, and Brunowski's The Ascent of Man, that seemed designed to put you to sleep. TW was almost the only program with a science or engineering focus.
For those having difficulty sleeping, they are currently repeating Civilisation on BBC4. A real child of its time. Watching Clark wander around the Med dressed in tweed suit and tie, looking just like some gentleman farmer, droning on interminably. I thought I would give it another chance, but fell asleep before the end of the first episode. Also his attitude to Muslims and their impact on civilisation would surely be questionable today.
