When coming to England (we can ignore the provinces as dark lands that lack cricket) it is important to know the correct and polite forms of address so people do not think you are Scottish.
I say I disagree should be pounced TWAT!!
Would you awfully mind leaving should be pronounced FUCK OFF!
I disagree should be pronounced CUNT!
When addressing a lady one should always refer to her as a slag, and an offer of rape will never go amiss.
It is also worth remembering that a offer to "punch you're light out you wanker" is often seen as a precursor to an evening of polite conversation and witty repartee.
If you have any questions then please fuck off.