There has been a response from DfE for internal emails on the subject of Flexischooling during March and April this year, which was the period during which the guidance on Flexischooling, changed for a second time.
Fiona has sorted them in chronological order, so there are now several sets of Freedom of Information responses covering January to April on her flexischooling web page here
edyourself.org/articles/flexischooling.php#FOIs