@NerrSnerr thank you, I'm enjoying our off topic conversation :)
"I do think there should be some monitoring out there. To monitor the children who are 'home educated' but actually in extreme religious schools,"
I've got this one at my fingertips: FoI requests show that in May 2018, there had been 218 inspections, 52 warning notices issued to settings operating as unregistered schools, and 46 closed or ceased operating as unregistered schools. The remaining 6 are in the middle of court proceedings. In other words, the current law is already being applied to stamp out this problem. No need to attack civil liberties of home educators.
"the children being 'home educated' but are being isolated and abused like the mumsnetters who posted on the old thread." Yes, that's ghastly. Registration and monitoring won't fix it, though. Anyone can put on a show for some LA person who comes for an hour or two a year. The only way to fix that sort of thing is for members of the public to report to social services when they are concerned about a child, just like it is now.
NB more FoI requests reveal that, across the whole country, home educated children are twice as likely as the general population to be referred to social services, and more than twice LESS likely to be put under a child protection order afterwards. I can hoick out the link if anyone wants it.
In other words, as far as children who are out and about in society are concerned, this is a non-problem and, like I said before, the ones who are being locked in the cellar by some fundamentalist nutter are still going to be locked in the cellar and nobody know about them. Awful, but curbing freedom for the rest of us won't fix it.
"I don't want to cause home educators problems, I just want more safeguards for children at risk." I think we have about as many safeguards as we can reasonably have; while the state remains the parent of last resort (which it is very much better at than being the parent of first resort), we have - as a society - to leave the upbringing of children in the hands of their parents, which includes education, unless there are genuine grounds to intervene.
Thank you for giving me the opportunity to rant about this stuff :)