Goodness, apparently the Cadbury Brothers understood the importance of work/life balance and an enjoyable working environment way back in 1879! Just found this lovely little post on Cadbury's new blog about their journey to fairtrade certification.
"The Cadbury brothers didn’t want their staff to resign themselves to living in the slums of the city, so instead, they bought a plot of land miles from Birmingham with a canal and good transport and built their Factory in the Garden"
http://cadburydairymilk.typepad.com/fairtrade/2009/03/the-factory-in-the-garden.html