Like a lot of HE kids my kids go to Cubs/Scouts with kids who are at school. They go to camps etc and spend a lot of time together and have made lovely friends.
They go to church and have made friends with schooled children there.
We join a choir group for primary-aged children run by the council every year and they've made friends there.
They go to chess club at the local library and have made friends with school kids there.
They go to the park and make friends with the local kids there.
My eldest is autistic, but she's good at making friends because she's had the safety of home to learn confidence and do things at her own pace. She has to learn how to handle her sisters, who are VERY different from her personality-wise so there's plenty of ... negotiating that goes on with them.
My family's in NZ, so we've made trips over there, and they've made friends with their cousins, who they hadn't really met before.
My kids can talk to people of any age - they love chatting with our neighbours, most of whom are elderly.
The whole socialising thing that people think home ed kids don't get is just another myth.
I'm not going to pretend that every parent who says they're home educating their child is doing a good job. Like parents of schooled children there are those who are lazy and neglectful, and obviously we've seen what happened with poor Sara. But like parents of schooled children, the vast majority of home educators want what's best for their children, and either school has failed them, or they have decided that home is the best place for learning, and putting unnecessary boundaries in the way of that isn't going to help children like Sara.
As I've said previously, I don't object in principle to the idea of oversight. I just don't trust the government/LAs to make good rules, and I don't see how they can possibly provide the staff, given how thinly stretched services are already.