In British English, people often use more subtle and indirect ways to express dissatisfaction or displeasure without resorting to overtly rude or offensive language. Here are some polite British expressions that convey a similar sentiment to "stuff you" in a more genteel manner:
Well, I never: This phrase can be used to express surprise, disappointment, or disapproval.
I beg your pardon: While it may sound polite on the surface, the tone and context can convey annoyance or frustration.
With all due respect: This is a way to preface a statement that may be critical or contradictory while attempting to remain courteous.
That's rather interesting/unusual, isn't it?: Used sarcastically, this phrase can imply skepticism or disagreement.
I'm sorry, but I can't agree with that: A diplomatic way to express disagreement without being confrontational.
It's important to remember that even though these phrases may be less explicit, their meaning can still be clear depending on the context and tone in which they are used. It's always best to strive for respectful communication to maintain positive relationships and avoid unnecessary conflicts.