H. P. Grice and J. O. Urmson: conversation as rational co-operation

Only they would never use such pretentious phrasing!

Grice might -- since he does use 'rational co-operation' in his 'Retrospective epilogue.'

However, on point is key as we review the similiarties between H. P. Grice's approach and one like Urmson's (say, in "Parenthetical verbs,"), or Nowell-Smith's (in, say, "Ethics,") or P. F. Strawson's (and his 'pragmatic rule' in "Introduction to Logical Theory") or J. L. Austin's (in "Other Minds," on 'That's a finch' implying that the utterer KNOWS it's a finch), or C. K. Grant's, -- just to restrict the comparisons to the Play Group.

That point is Grice's explicit, if later, use of expressions from the 'rationality' realm (he was a linguistic botanist). An expectation of conversation is 'reasonable,' or 'rational.'

Other Oxford 'ordinary-language' philosophers may not press the point like Grice does!