No need to explain. I can quite see how it happened.
4 seconds sound clip from the The Remains of the Day movie soundboard.
You can hear this line at 01:20:29 in the Blu-ray version of the movie.
Quote context
[...]
- Not such a bad bunch, are they.
- No, no, sir. Mr. and Mrs. Taylor were extremely kind.
- I say, I hope you don't think me very rude, but you aren't a manservant of some sort, are you?
- Em... Yes, sir. I am, indeed. In fact, I'm the butler of Darlington Hall, near Oxford.
- It wasn't my intention to deceive anyone, sir.
- No need to explain. I can quite see how it happened.
- Sorry, sir. I never knew that Lord Darlington.
- My employer's an American gentleman, Mr. Lewis.
- Yes, Lord Darlington was among those who tried to make a deal with Hitler.
[...]