Interesting, I remember it well. (if its the one I'm thinking of...)
I was working at Teddington Studios then. Live-Aid was mega and Thames OB had a large input to the Wembley production. Teddington had microwave links to Wembley, the usual land-lines(we only had two outgoing) and parallel microwave links to the Post Office Tower in central London. It was all belts and braces, and lots of divergent paths.
Biggest production to come through Teddington till the next royal wedding. We recorded everything incoming on every available machine. Nobody told us to, but it seemed a good idea at the time. Must have been a Saturday, as it was quiet?