If you do happen to speak to Ofsted in your role as a home educating parent, could you let Lord Lucas know. Details here.
Lord Lucas says of the Ofsted inspections:
"I am not happy though with the secrecy with which Ofsted is surrounding its investigation - which LAs, which parents will be talked to, etc. I have put down some questions to see if I can open them up. Nor am I confident that Ofsted understands home education - but talking to more HE parents and children should help."