Grice on Heath, Wilson, Nabarro, and Thorpe

"I am NOT now contradicting what you say. I am certainly NOT denying [emphasis Grice's.] that Wilson will be Prime Minister. It is, rather, that I wish NOT to assert what you have asserted, but, instead, to substitute a different statement which I regard as preferable under-the-circumstances. I shall call this 'substitutive disagreement.'"