Not quite true FJ,
The Balpa agreement we have on part-time states a mximum of 490 flying hours per 365 consecutive days for 50% and a maximum of 700 hours for 75%
Sure you'll get longer days but you work only 10/15 days a month. I agree that 75% seems a bit useless, as I don't do many more than 15 days a month full time anyway..
@ Arturo: I'm not sure how the pattern would work, if you could work month on month off or so, but why not call and ask easyjet?
Part time is only available for a limited amount of people per base, so its no guarantee you'll get it.