It is "extremely challenging" for councils to ensure children taught at home in England receive a suitable education, inspectors have warned.
Ofsted said the absence of a home education register meant authorities did not have a full picture of how children in their area were taught.
There is no official figure for how many UK children are home schooled, but is estimated to be around 50,000.
Proposals for a register for home educators were shelved in April.
Home educators rejected the suggestion that a register for home-schooled children was necessary.
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