"For many years the record was held by former world professional pursuit champion Tony Doyle, who in 1980 recorded 56′ 30″ on a pretty-much standard for the time track bike with drop handlebars." https://roadcyclinguk.com/blogs/richards-blog/fast-pedalling-on-fixed-wheel-for-cycling-fun.html
That's clearly the same ride. As I said, I can't give any authority for my story at the moment, but I will make enquiries.
@clubman started
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"For many years the record was held by former world professional pursuit champion Tony Doyle, who in 1980 recorded 56′ 30″ on a pretty-much standard for the time track bike with drop handlebars."
https://roadcyclinguk.com/blogs/richards-blog/fast-pedalling-on-fixed-wheel-for-cycling-fun.html