Heavy crew, we DO have to provide a service aboard ALL easyJet flights - the only difference is that our passengers have to pay for food & drinks. We also operate a Gift Shop service on all flights too.
As to who works harder/has more hours, as I don't work for BA I couldn't comment; BUT, lest anyone else get the wrong impression, staff at ANY LCC will work extremely hard - 4 sector days with 25 minute turnarounds (including cleaning the aircraft ourselves, crumb by crumb) is no light task.
I invite anyone to operate a LTN-FAO-LTN-AMS-LTN service under aforementioned conditions; both FD and CC work extremely hard 6 on 3 off nonstop at ezy and fatigue is a major problem. The reason for the relatively good pay is simply that staff operate a high number of sectors every month. Work hard = good pay.
But then no one forces us into the job, and I still enjoy inviting our passengers aboard every day.
rgds