Recorded Delivery1st April 1969
Dear Sirs,
On at least five occasions, very probably many more, the security authorities have interfered with friends or acquaintances of mine and made defamatory remarks about myself. The latest instance of this has just been brought to my attention by the person concerned, and I must state that I am getting fed up with hearing from my two brothers in the R.A.F. (one now ex-R.A.F.), from people like Professor R V Jones, from my cousin Cordelia Carey in the M o D, that they have been warned about me. As you must surely know from your files, I am not a security risk; I have never belonged to, or been affiliated or inclined to, any political party other than the Conservative Association at university. I am a writer, pure and simple. My books, in so far as I obtain access to official files within the closed period, are properly vetted and passed for publication. There could be no writer more orthodox than myself.
In the past I have repeatedly shown myself to be on the side of the security authorities. In 1963 I volunteered information to Special Branch in connection with the activities of a Right Wing lunatic whom I considered to be a psychopath and potentially dangerous (Chief Inspector Gilbert of Special Branch will confirm this). I am 100-per cent of British birth, and my Father was a career officer in the Royal Navy.
If you have any reason for continuing to persecute me by intimidating my acquaintances who happen to be in the Services, and whose friend-ship I valued, I should welcome an indication from you of what it is. If you have not, I would be grateful if you would give me your assurance that you will not repeat these despicable threats, which are irritating to me and may well harm my very livelihood. I repeat, I am not a security risk – but if I do not hear a favourable reply from your Branch, I shall feel obliged to protest to the Permanent Under-Secretary, with a full file of details about your interference with my friends.
Yours faithfully,

(David Irving)
Security Branch,
Ministry of Defence (RAF),
Adastral House,
Theobalds Road, WC1