I spoke to my centre about this. The problem they have is privacy. Whilst they state priority of care, it is hard to enforce, as they can't really ask for proof that a parent is working. I have been on both the working and non working with childcare. When I was not working, it was stressed to me that I may have to change a day, or drop my spot for someone else. I did have some priority at the time due to being new to town (no support) and pregnant. I had two days then, but lost a day with the change of year, I was offered it back a couple of months later.
When I did start working though, I had a hell of a time getting the days I needed. Different centre, but run by the same council (so same upper management, policy, shared staff etc). I had to really push for days and when I did question the priority of placement, then I was told about the privacy issue. I know many of the kids, the parents were not working and could be flexible with days (they were school mums who I spoke to, I kind of knew their schedule). I would never have asked for them to completely lose their place, as I do understand the importance of it, but all I asked for was some flexibility with placement.

