The pay rate is the headline, but it is far from the ultimate benchmark.

The consideration of paid breaks (still exist for large proportion of drivers in Durham County for example), plus the black and white rules around paid time (some operators only pay actual platform time, others pay shift time etc).

Only when you build that picture up, do you truly understand the value of the role.

For example, a lower rate paid right through can actually work out better value than a high rate, only paid when you are physically sat in the cab. Both duties might be 10 hours, with 8.5. hours driving time. Driver on £13.50 paid through gets £135. Driver on £15 only paid for platform time gets £127.50. Exactly the same length of time spent essentially at work. Don't be seduced by the rate.

That doesn't for one minute suggest that 4% is or isn't a fair deal, but a simple comparison of pay rates is not a barometer.