By Daniel Hunter

The quality of jobs completed by UK workers fell for the first time in 2014, according to the Office for National Statistics (ONS).

The ONS has taken the measure since 1994 to determine the UK's skill level. It had risen every year since it was launched, but fell in 2014.

The statistics agency said it may be due to an above-average increase in the number of hours worked by 16-29 employees, who would be expected to be lower paid and lower skilled than more experienced workers.

The ONS said 2014's fall "suggest[s] only that labour quality has stopped exacerbating the productivity puzzle; they do not explain it".