"Dear Mrs Snodgrass. After a thoughtful holiday weekend considering your response to my invitation, I've come to the regrettable conclusion that I must withdraw my invitation to you for dinner on account of the unfortunate attitude you have taken with my dear friend Alistair Quigley. It is with a heavy heart that I tell you that I simply cannot allow a potential guest of mine to dictate to me my very own guest list. Again, it is with a most lamentable tone that I compose this missive as it has led to another unfortunate situation which is the awkward gesture of withdrawing my invite, but I wouldn't be a principled man if I didn't stand by my own principles. As a lady of society I'm sure you can see the predicament I currently face.
In conclusion, I do hope that you, Mrs. Snodgrass, do not view this as a rejection but as a problematic compromise. I shall end this letter with a request that you take heart and reconsider your initial response. Perhaps you made your decision amidst an emotional moment and that with time and a proper understanding of my position you will come to respond next with the tact and character that is expected of you. Yours in sincerity, Mr Mews."