This chapter considers a major phenomenon in the regulatory state, which is all too easily glossed over — the role of ‘bureaucratic regulation’ of public bodies by other public bodies. A prime concern is the instruments of the so-called ‘audit culture’ which has flourished in the UK under successive governments. The chapter gives an insider's view of the role of the National Audit Office in scrutinizing the workings of the regulatory reform agenda, with particular reference to the fashionable tools of impact assessment and risk-based evaluation. In so doing, it emphasizes the empowering of parliamentary scrutiny through reports on (lack of) value for money to the House of Commons Public Accounts Committee. It also emphasizes the importance of the work in terms of the economic footprint of regulation.