Re: Full day for a Frenchman?
Sadly the difference in labour productivity (GDP per capita) between France and the UK means that the French worker does more in four days than the British worker does in five.
Don't think there is an easy answer to this. UK economists have been racking their brains over this weak spot in the UK's economy for many years. If you have the answer, get on the phone to the government and bag yourself a very very well paying job.