My experience of UK schools is not as you state, OP. The teachers might have heard of ASDs, but that doesn't mean they know how to deal with kids with ASDs. In my part of Scotland, we tend to have primary aged kids with ASDs either in mainstream or in specialist autism bases, within mainstream schools. At secondary, they will either be in mainstream or in a special needs high school (not specifically for autism). The autism bases have a very good reputation, but are not suitable for children like my daughter, who is too high functioning and emotionally stable to be considered to attend one. So, she's in mainstream, which is not really suitable either. The teachers don't appear to get her and have seen her difficulties as being lazy/ not trying, even though she has a diagnosis. She needs something kind of in-between, which does not appear to be available.
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"We act as though comfort and luxury were the chief requirements of life, when all we need to make us really happy is something to be enthusiatic about." Charles Kingsley