Since Quizmaster's British Prime Ministers quiz accepts Pitt for both, and since all the presidential quizzes accept the surname only for the Roosevelts/Harrisons/Adamses, I've changed it to accept just Pitt.
Believe this should be updated. Wikipedia says the new PM (Keir Starmer) is an atheist so at the very least, the “held no religious belief’ question should have one new valid answer.