I entered a UK 4th category Crit race at Thruxton in 2019 and got pinged by one of the commisairs (sp?) for my socks being too long.
I was flabbergasted and more so when he proceeded to cite the relevant rule book clause that in his words covered the issue under the auspices of the Crit being a British Cycling (UCI regs apply) sanctioned race event.
I rolled them down