We're planning a relocation very soon. Due to school admissions and DD2 due to start school next September, we're planning on moving around Christmas time, most likely into rented, so we're in place for catchments etc for decent schools in mid January. Later on next year we'll probably buy our "forever" house but we don't want time pressures and so on and it's easier to find a decent house when renting. All well and good.
However DD1 is in Y1. She's currently at an "Outstanding" school, albeit in a deprived area, and doing very well, not wanting to stealth boast but she's well ahead in most areas and we don't want to lose that momentum. It seems unlikely she'd be able to transfer immediately to whichever school we're siting ourselves near for catchment purposes as they're surely going to already be oversubscribed with waiting lists. We're moving sufficient distance (SE London to the Hemel area, probably Boxmoor but possibly Berko for local sorts who may have extra insights) for it to be impossible to commute.
DD1 does not like change, although she does adapt and is very sociable once she stops being shy! She's currently a popular child, although I was bullied horrendously at school and we have similar personalities so I do worry.
Obviously we're hoping that next September when her sister starts at whichever school it is that DD1 would be bumped up any waiting list due to sibling priority if she hasn't got in already. But that's still most likely at least two terms where she'll need a school and even then there are no guarantees at all.
It's probable a school within the distance rules will have a space in the meantime, but whether that school is any good or not is obviously out of our hands - most likely not if the good schools are popular. It's not the end of the world if it's a rubbish school but I have vague concerns over a rubbish school doing more harm than good, especially if it's somewhere that bullying is rife.
We're left with the decision then of either sending her to a less than ideal school then hopefully swapping her over at some point, which she could well find disorientating. Three schools in two years is pretty bad, isn't it? Or homeschooling her.. which isn't ideal either as although I fully support the idea of homeschooling, I don't know how good I'd be at it and I have two other DC - DD2 and DS1 who is currently 16 months.
And of course all this assumes we're able to get DD2 into a decent school at all when it comes to admissions time, and then that a space ever becomes available for DD1 at that school. I can just see myself needing to be in two places half an hour apart at 3.30pm each day 
Your thoughts are all very welcome!