compton - you may well be right, but it's possibly worth noting that Easyjet fly Luton-Paris 19x per week (3x on weekdays and 2x on weekends), making a day trip for work quite possible whether you live in the UK or France
Darwin fly Cambridge-Paris 6x per week (not Saturdays), and at times which make even an overnight trip for work really quite inconvenient.
CBG 0950 CDG 1200 12345--
CBG 0900 CDG 1110 ------7
CDG 1240 CBG 1240 1-3-5--
CDG 1655 CBG 1700 -2-4--7