Up to a point......

What the British say	What the British mean	What others understand
I hear what you say	I disagree and do not want to discuss it further	He accepts my point of view
With the greatest respect…	I think you are an idiot	He is listening to me
That's not bad	That's good	That's poor
That is a very brave proposal	You are insane	He thinks I have courage
Quite good	A bit disappointing	Quite good
I would suggest…	Do it or be prepared to justify yourself	Think about the idea, but do what you like
Oh, incidentally/ by the way	The primary purpose of our discussion is…	That is not very important
I was a bit disappointed that	I am annoyed that	It really doesn't matter
Very interesting	That is clearly nonsense	They are impressed
I'll bear it in mind	I've forgotten it already	They will probably do it
I'm sure it's my fault	It's your fault	Why do they think it was their fault?
You must come for dinner	It's not an invitation, I'm just being polite	I will get an invitation soon
I almost agree	I don't agree at all	He's not far from agreement
I only have a few minor comments	Please re-write completely	He has found a few typos
Could we consider some other options	I don't like your idea	They have not yet decided
Correct me if I'm wrong	I'm right, don't contradict me	I may be wrong, please let me know
Up to a point	Not in the slightest	Partially

The Economist column gives only these three French phrases — does anyone have a longer list pinned to their wall?

French Phrase	Literal Translation	Idiomatic Translation
"je serai clair"	"I will be clear"	"I will be rude"
"Il faut la visibilité Européenne"	"We need European visibility"	"The EU must indulge in some pointless, annoying and, with luck, damaging international grand-standing."
"Il faut trouver une solution pragmatique"	"We must find a pragmatic solution"	"Warning: I am about to propose a highly complex, theoretical, legalistic and unworkable way forward."

via languagelog.ldc.upenn.edu