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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
hippy
clubman
Hippy's MG Bike
I believe that Tony Doyle's 56 (Crabwood event 1980) which put the record on the shelf for 19 years was done on a geared road bike with the gear mechs stopped down to give 72" as top.
Most of the MG record info is here:
http://www.fixedwheel.co.uk/medium%20gear%20history.htm
But I don't think that site mentions the road bike aspect of TD's record.