Booth served as sub-dean of the Chapel Royal, Deputy Clerk of the Closet, subalmoner of the Royal Almonry and former domestic chaplain to Queen Elizabeth II, appointed in 1991, was the sole full-time member of the Ecclesiastical Household of the sovereign of the United Kingdom.
Booth held a unique position within the royal household, serving as the sole full-time member of the Ecclesiastical Household of the British monarch. His roles included subdean of the Chapel Royal, Deputy Clerk of the Closet, subalmoner of the Royal Almonry, and former domestic chaplain to Queen Elizabeth II.