Are you urban or rural blowin? I'm assuming areas with few schools are much less likely to be run at absolute capacity. I don't know about other areas, but I think the main problem we've had in Edinburgh is that at various times there has been a fair amount of capacity in schools, but instead of leaving them (as would probably happen in a more rural area) the council have jumped on the chance to save money in one budget year, whilst ignoring the fact that in a few years they will have to spend much more money building extensions/reopening schools etc.
There seems to be nobody on the council taking a long term view of 'well this school has quite a lot of capacity at present, but we could cut a class now and then change back again in 3 years time because we have a lot of children who've been born in the last year or so'. Instead they seem to be trying to run all the schools as full as they can manage - I appreciate that this might make short-term financial sense, but the reality is pretty grim. So they think 'these three schools all have a little bit of capacity, we'll close one, take away a couple of meeting rooms and then we'll have two schools efficiently running at full capacity. Then they look confused in two years time when all the children who they already knew about apply for primary 1 places and they don't have anough room.
When I was at primary, it was a rural area and we had four teachers which went down to three when our year left. There was another school we knew of that only had two teachers. But these schools were kept open, there was no problem getting a place in them, and if another teacher was needed then another teacher was employed. Because it would have been too far to travel to go to another school. In the cities the councils can be much more trigger happy about how they manage this, and the result has been the situation people are talking about here with appeals etc.
We have two primary 1 classes in one large room. The teachers seem quite enthusiastic about team-teaching. Personally the thought of almost 50 children in one room give me the shivers (fortunately I am not a teacher).
It is one of the reasons I'd like to move out of Edinburgh to be honest.