My memory is probably playing tricks on me, but I was under the impression that Danny Williams was caretaker manager for a little while after Bob Smith got sacked and before Trollope took over. As I say, it's probably my memory playing tricks on me as I have not seen it mentioned anywhere in his managerial record - I probably confused it at the time with him being General Manager.
Whatever, I only started supporting Town in 1979 so missed the cup glory by a long while and just missed out on seeing Danny as a manager, but every Town fan should be grateful to him and the 69 team for ensuring Swindon Town's place in the history books.
No I am pretty sure he was caretaker for a few weeks after Bob Smith left, taking on what they called "the firefighter" position.