"I would be happy to take his details, Lady Rochester, if you would be kind enough to provide them. Something that would provide her with the energy she requires, a revitalising tonic sounds just the thing."
He paused then, glancing about the room. "I hope you won't find me rude for saying so, my Lady, but I have not yet seen either of your children tonight. I hope they are otherwise engaged and not ill? Although I would completely understand why Katrina would want to stay at home and not venture out."