Letter from the National Audit Office - the NAO will not investigate the concerns I raised under the Public Interest Disclosure Act (PIDA) 1998 - that Her Majesty’s Revenue and Customs (HMRC) misused public funds to charge and convict me of holding ‘extreme political views’ for heckling the British National Party (BNP) at a peaceful protest outside work. They don’t want the public to know how much public funds HMRC misused for the BNP.