What were the costs of the EHE Review?

Education: Home Schooling
Question asked by Lord Lucas: To ask Her Majesty's Government what were the costs of the Review of Elective Home Education in England by Graham Badman; and what were the costs of the information-gathering exercises which have followed it. [HL430]

The Parliamentary Under-Secretary of State, Department for Children, Schools and Families (Baroness Morgan of Drefelin): Following careful consideration Ministers have decided that this information will remain confidential because of the potential impact on those involved in the review. There have been a large number of postings on various websites and blogs harassing Mr Badman and the apparent campaign is continuing. The department will review the position again in the new year.

The information-gathering exercise that followed the review did not incur any external costs as it was conducted by departmental officials.

From here.