Frightfully sorry, old man.
4 seconds sound clip from the The Great Mouse Detective movie soundboard.
You can hear this line at 00:23:49 in the Blu-ray version of the movie.
Quote context
[...]
- I say, Basil, who is this Toby chap?
- Ah! Here he is now. (PANTING)
- Now, Toby, stop that! Toby, cease! Desist!
- He has the most splendid sense of smell of any hound I've trained. But he can be deucedly frisky.
- Silly doggy! Would you like a crumpet?
- Now, Toby? To the matter at hand. I want you to...
[...]