'"a campaign to put razor blades under the flaps of letters"

That I find difficult to believe. In his book "Bureaucrats and how to annoy them" (published under the pseudonym R.T.Fishall) he is quite emphatically against anything illegal.'

At the time I was working as a civil servant, and we were officially warned to take care opening the post in the light of this campaign. It was also seriously reported in the 'Sunday Times'.