...is tabled for Tuesday 9 June at 1pm in Westminster Hall. It has been called for by Conservative MP Mark Field who discussed home education in the last paragraph here.
Home educators, including children, are also welcome to go along. It doesn't look as if you need to book.
Apparently there are about 25 seats available on a first come first served basis. Children welcome.
The debate will also be shown on the Parliament Channel (will check for times), and will last half an hour.