David Cameron at St David's Day reception

The speaker warmly welcomes attendees to the event, sharing a humorous anecdote about his wife, Mrs. Cameron. He discusses the flying of the Welsh flag at Number 10 Downing Street, highlighting the significance of the occasion. The speaker reflects on the progress of Wales and mentions the Dickens anniversary, describing it as the best of times.

What humorous exchange did the speaker have with his wife?

What literary reference does the speaker make in his speech?