There is an article on Womens Agenda, called the 31 most powerful part-timers. Is a kind of interesting read - although I am not quite sure how they qualify what is part-time - this one for example "three days (7am-4pm) and two days (9am-6pm), with home duties shared with her husband" - how is a 40+ hour week considered part-time?

Reading it further it appears it is actually about flexible working - not really just part-time at all. I have found lots of places are totally ok with flexibility but not so much with part-time - as in less hours a week spent working.