Ermmm . . . that's actually not correct. Under domestic driving rules, it is possible, legally, NEVER to have a "day" off.
The regulations state "a 24 hour rest period must be taken every 14 days". This might mean that the maximum number of consecutive days worked equals 13 days . . . not so!! Provided that a period of 24 hours consecutive rest is taken every 14 days, it is possible, and quite legal, for a driver to work continuously.
EU and GB domestic rules for drivers of goods vehicles and passenger-carrying vehicles
www.gov.uk
EC rules are much tougher, and require a "full" day off to be taken after 7 days continuous work. There are also restrictions as to the number of driving hours in a 7 day period . . . 56 hours in 7 days, or 90 hours in 14 days.
In my (much) younger days, in my 20s, I worked 20 consecutive days . . . after (I think) my 12th day, I worked an early, finishing about 1400, and started a late the next day at about 1600 . . . so I actually had a 26 hour rest period. This was during a period of intense staff shortages, and was done with the agreement of my garage duty clerk. It was me that called a halt . . . after 20 days, I was exhausted, and told him that I needed a couple of days off to sleep!! TBF, the duties were quite short, compared with today . . . 8 hours driving per duty was seldom exceeded, although there was always overtime available . . . !!
I have actually heard of a driver that worked a 28 day period without a day off, by much the same arrangement . . . they didn't tell their duty clerk, however, and it only came to light when they had an accident, luckily minor, and they 'fessed up. In that case, the driver had been swopping duties to avoid a route they detested, and it hadn't been picked up. This was around 20 years ago, and the procedures were tightened up at this garage to stop it happening again. If they hadn't had an accident . . . who knowa how long it might have continued . . . the company policy was that drivers must always have a "real" day off after 13 days.