David Mitchell said this quote

In March of 1915, all three of Lord and Lady Chetwynd-Pitt's sons'd been gassed, blown up or machine-gunned in the very same week at the battle of Neuve-Chapelle. All three. Imagine that: On Monday, you've got three sons, by Friday you've got none. Lady Albertina had just, y'know, caved in. Physically, mentally, spiritually, brutally.