Ab Jenkins 1933.
The 1930s were a fascinating time for long distance record breaking.
The Voisin set the 24 hour record at 113.5 mph in 1932. Ab Jenkins, John Cobb and George Eyston then raised it almost every year (sometimes several times a year) to 117.8 mph in 1933, 127 mph in 1934, 140 mph in 1935 and 157 mph in 1937. Eventually Jenkins (with a co-driver) reached 161.18 mph in 1940.
Amazingly, 161.18 mph remains a class record for 24 hours, although it is no longer the outright record.