You may as well ask a committee of the Mothers' Union to organize a war campaign.
6 seconds sound clip from the The Remains of the Day movie soundboard.
You can hear this line at 01:19:32 in the Blu-ray version of the movie.
Quote context
[...]
- One moment, I have another question to put to our good man here.
- I'm sorry, sir. I am unable to be of assistance in any of these matters.
- You see, gentlemen. Our good man here is unable to assist us in these matters.
- You may as well ask a committee of the Mothers' Union to organize a war campaign.
- Thank you, My Lord. Thank you, sir.
- Yep. Well, you certainly proved your point there, Spencer.
- And, what did you make of the citizens of Moscombe?
[...]