Not personally, but I was listening to a section on Jeremy Vine last week and they basically said once the decisions are made its very unlikely they go back on them. Even when siblings are separated they won't change their minds.
Same story happen for me. Second accept us not first. Even we are half mile far from school they reduce it to 0.4 du to high subscribe. Anyway I had few research and my advice would be that. All parents have difficulties with kids using the bathroom in preschool; this cannot really be used as a strong excuse unless the school you prefer specifically says they will help clean up the children — which is unlikely. My suggestion is this: look at the curriculum of both schools. See what differences there are, and point out exactly the program your preferred school offers that the other school does not. You can say, “I want my child to have this specific program, which unfortunately the second school does not offer.” This could be a reason for your appeal.
Hope that helps. This was an advice I get from admission. Also put your child name on waiting list as well. Don’t forget to accept the second choice because if you don’t accept it and your they don’t accept your appeal council decide your child school.
No advice but commenting because I would like to know the answer to this. I want my child in a school that isn't in the catchment as my catchment school is not good at all- I read ofsted reports etc 😢 hope you get the answers you need though xx