Who said Tact is the ability to tell someone to go to hell in such a way that they look forward to the trip?

The quote "Tact is the ability to tell someone to go to hell in such a way that they look forward to the trip" is attributed to Winston Churchill. This humorous remark highlights the skill of delivering difficult messages with grace and diplomacy. Churchill, known for his wit and oratory prowess, often exemplified tact in his leadership and public speaking.