we did.
I was in Kent, and getting nowhere fast with dd1. she was dx'd ASD at 2.6, and is an August baby, so should have started school in Sept 2008, aged just 4. We battled the lea all the way - they said first of all she should be in mainstream - dd1 is scared of children (ok with adults on the whole) so there is no way putting her in with 30 other children was going to work.
she has a severe langugae impairment, and is often misunderstood/overlooked for support because she appears to cope so well. in fact, she is very good at quietly imitating, and if something bothers her, she is likely to get even quieter -passive to the point of comatose sometimes - so if you are not constantly guaging her reactions then things are very easily missed.
by the time she was supposed to be starting school, we had no statement in place (despite battling for over a year by this point) and so we kept her at pre-school while we worked out what to do. Kent is extremely inflexible on this, and if she had stayed there for the year, she would then have had to leap into Yr1. she was turned down for the ASD unit because she was too passive (?!), and so the only other school Kent could offer was an SLD school, which is not appropriate for dd1.
so, we found a private ASD school in Surrey, and within 2 weeks we had moved and had her enrolled. she spent last year there too (again, it was a pre-school, but we thought at least this one would have a decent knowledge of ASD. sadly we were wrong)
anyway, it didn't work out for dd1, but it did mean we knew exactly what we wanted. we had tried mainstream, tried specialist ASD, and we are now in a very strong position with Surrey lea to win the exact type of school we want (ABA school) because we have a proven record of dd1 not achieving anyhting by any other method.
so, the move was both a disaster and also very positive - mothing simple in this life, hey?
dd1 has now started at an ABA school (again, we are luckily able to privately fund while we fight), and we are heading off to tribunal later this year. our case is very strong, and eventhough the reason for the move (the first school) didn't work out, it was still invaluable for us in narrowing down exactly what dd1 needs, and why.
sorry for the length