This is the interval of time in seconds between hearing Zoe Ball or Sara Cox on Radio 2, and changing channels, source, or turning off the abomination entirely. The Ball-Cox interval varies greatly by individual, but usually increases in value with a corresponding fall in IQ score.

Whether it’s the inane kiddie singing on national radio in the morning for Ball, or the slurred drivel of Cox in the evening, the interval is on average the same in individuals who are exposed to one or the other at either end of another tedious commute.

The soothing hum of tyre noise is another favourite alternative commonly sought.