To whose statement that if she were married to Chruchill she would poison his coffee did Winston Churchill famously reply "If I were married to you, I'd drink it." ?

This was famously supposed to have been banter between Churchill and Nancy Astor (an American, but I know it as tea, not coffee, nonetheless ). She was an ideal sparring partner for Churchill. Notably feisty, and a famous wit in her own right,she is likely to have 'tea-d' him up for the riposte.

She was the first woman to take a seat as an MP.

He is reputed to have replied to a woman who accused him of being drunk by "And you Madam are ugly but, in the morning, I shall be sober" The other party is variously named, a favourite being Bessie Braddock, a doubty, obese, Labour politician, but the differing names suggest this is an apocryphal tale.

Spot on !

Thanks for the answer.